i have a 88 iroc z 305 that is bassically stock it is in very good condition my dad was the original owner when he gave it to me i polished the engein and put in a new distributor injectors 8.0 wires spark plugs and alot of new sensors now that i have done that i want to work on preformance.
She aint to fast i mean it is for a stock car but i wana tear up the ricers and import tuners as well as those mustang gts.
I i was thinking i should put in the chevy (350ci) ZZ4 crate moter with 355 HP get the base moter and just put on my intake manifold and up to save some cash, but i didnt know if i should change the gear ratio in the rear end first and if it would help my 0-60 if i did. im only looking to spend about 2.5 to 3 grand in a moter and if changeing the gear ratio in the rear end would help about alot i can do that to keep in mind the moter has 150,000 miles it runs great though and its an auto transs.
any help will be greatly appreciated.

 

You should really post this and search in the engine section(s).