nytrdr24
+1y
welcome to the b-scene!
on the 350 swap, since it is a chevy, the dizzy is on the back, you'll have to mod the fire wall & the tranny tunnel to make it fit. as far as the rear end, you will probably want something a little stronger than the factory mazda unit which is good to @ 200 hp, you can get a 89-95 yota 4x4 rear, they come in different gear ratios are the same width as mazda, & you can get a lsd unit or locker, and downey off road offers a disc brake conversion too, but really that is your choice on what rearend to use.
as far as bushing, are you wanting leafspring bushings? you can get them off of summit or perfomancecenter.com, measure the eye on the leafs, i think they are 2", & get a set of bushings accordingly.....
on the gas guage, mazda's run 90-o ohm, and gm units run 0-90 ohm which would show exactly backwards full when empty, empty when full, which is what i have to run with my fuel cell. other than that, you can get a sending unit from an autoparts place, or mazda dealership
the strips, either a junk yard, or mazda dealership,
and all of the cool parts are getting harder to come buy, the clear tails haven't been in production for a minuite, the only way to get a set is e-bay or something similar......
happy hunting & welcome aboard!