1989 Mazda B2200 SE-5----tons of blue smoke coming from pipe

I bought a 1989 Mazda B2200 SE-5 ext. cab yesterday-its a 5 speed-and today when I started it and then drove down the road, the entire block was a trail of blue smoke! The guy I bought it from said he changed the timing belt, new head gasket, all new upper end gasket job including valve seals, and installed a Pace Setter header.
Why in heck is it blowing blue smoke out of the tail pipe???? Its embarassing to leave a block long trail of smoke! Anyone who can help it would be AWESOME! I am a broke college student and just trying to get some reliable transportation to and from school. Is this going to be expensive to repair? How hard is it? Do I need to take the truck back and get a refund?
Thanks again to anyone that can help! I really need it

it is possible that if it's a very fresh head gasket it still needs to clear the rest of the crap out of the system. Try taking it for a nice stroll down the interstate for a while.

my guess though is that the oil rings are gunked up and not sealing properly, thus allowing oil to go through the rings and into the combustion chambers. what do your plugs look like?

could also be a bad/missing pcv valve, with excessive blowby you can find a lot of oil going down the carbie.

^^^^^ agreed and i have gone threw part of auto motive tech and am NATEF certified in auto engine repair. If the rings are bad, you will have to buy a new set of rings, drop the hole motor out drain it of oil, pop the oil pan off, take the bolts out that are there, take the crank out, pop the pistons out ect ect ect.....lets just say you wont have your rig to drive for a long time if you decide to fix it yourself. and if you take it to a mechanic... machanic=$$$$$$ big bucks outa your pocket....just throwin my .02 in.

So in your guys opinion I should just return it to the guy or just sell it off and take a loss? I mean I think I can get pretty close to what I paid for it. There is not a single spot of rust on it. The original owner had it undercoated and foam put into the panels to prevent rust, and the interior is showroom floor condition, just one small tear on drivers seat (about 1/4")
I am only asking about these options b/c I know where the gas, oil, and keys go in a car. I know NOTHING about repair! Thanks again guys

sounds to me like the head may be cracked

Well he did say that he put a new head on it, and it does look brand new. I think Im just going to throw the damn thing on craigslist.

do a compression test on it wet and dry that will tell ya if the rings are bad

ok, does it smoke most on startup and then stops after it warms up? or is it constantly smoking? Is it on acceleration or deccel? it shouldn't smoke after a head gasket job, if the repair was done correctly.

when I turn it on it smokes like a MOFO!!!! then once it warms up (I know the engine is warm b/c I can hear the antifreeze boiling in the radiator...) but it still smokes alot..I just so pissed off about it but I love mazdas n not sure what I should do. Mostly when I start it, then when I go in first ALOT then shift into 2nd then THE WHOLE BLOCK.....LIGHT BLUE SMOKE....to the point where cars behind me slow down. Thanks so much man for responding..Im about done with this truck

if you're smoking blue.... and you're sure its blue.... it means you're burning oil. if it's on accel, its most likely piston rings. Idk what kind of tools you have available, but you can rent a compression gauge from autozone or whatever for pretty cheap. pop out a spark plug, screw in the compression gauge in place of the plug. unplug the coil wire from your distributor and clamp your main fuel line. then hold your throttle wide open and crank the motor over 5 or 6 times. check the reading on the gauge. you're looking for somewhere around 150 psi on each cylinder. if its lower than that, squirt a little oil into the cylinder through the plug hole, then repeat the steps. if it raises compression with the oil its bad rings. if not your problem lies elsewhere.