5k is easy if you look at this way.
get an iroc or firebird, preferably a 350/700r4 or a 305/t5, they can be had for 1000 maybe more maybe less, just try to find one that runs ok and looks horrible-not hard. yank off all the tpi associated hardware and sell it on ebay, my buddy got 200 last week for just the upper and lower manifold with tb and injectors. the whole setup with ecu and relays ive sold on ebay for 500 and change. sell all the body parts of the car that you can, ttops, glove box, whatever, and you will have most or all of that money back, and have a drivetrain, and the driveshaft for the conversion.
get the jtr kit, its less than 300.00 after youve sold all the iroc stuff. then get you a nice four barrell carb, headers, vacum advance hei dist, electric fuel pump, aluminum intake, and other stuff to get the car running. also get the adaptor for the diff side of the driveshaft, and measure out how much would need to be cutt of that iroc driveshaft, which is frekin huge.
plop the whole mess into the zcar, bolt it down, wire it up, tune it, and let loose, if youre really gung ho, make the tpi work, true it sucks for high end, but so does the engine it came on. the 350 is good for about 245 flywheel, and the 305 is 180 at the flywheel. not hp motors, torque motors. youre stock L motor puts down about 110 if its lucky.
if i was going to do another one, i would build a cruiser like this with the tpi and a 700r4, or the t5 if i could find a 305/t5-those are pretty rare around here and the people that have them love them-mullet and all.
i would get a roller cam year though, forget which ones that was.
you would have a engine that loves 87 octane and wot, and kick a lot of butt on the street with it as well.
yes, i know the hp figures are low, what else could you do with a 5k max?