timing chain water pump and oil pump

are these all things that would be overlapping in labor and benifical for me to replace all at once or will i have my whole motor torn apart to replace all these?

oh yeah and would you be hesitant on buying these parts off of ebay?

u can replace water pump w/o changing timing chain..but if u do oil pump, i'm bout sure u might as well do ur timing chain..not sure about buying those essential parts on ebay..

if yer gonna do a timing chain, do everything. you gotta take the wp and op out to get to it anyways so may as well.

id get a timing kit from engnblder..... they usually have their kits on ebay. oil pumps....... you get what you pay for. i'd personally do what i did and drop a good coin at toyota for a genuine.... you cant beat it. they last how many miles???? usually find out theyre the originals when i replace some at 200k...

Or beef it up,go with LC's double row chain,high out put oil pump,ect!!

The timoing chain cover can be pulled with the wp and the op on the cover only a coulpe of bolts go through
I'm using a Ebay chain kit with metal backed guides and a OE Toy tensinor no problem and I have a dual carbs cam and milled head I'm getting another oil pump to put myLC underdrive pulleys on as far as ebay oil pump imo you should be alright you can check the clearences when you get it