[amac209]

the reason it won't fit is you got the wrong engine. the 350 crate engine you bought if for a 96-98 chev meaning it has vortec heads. what you can do is buy an intake from gm performance parts that is a tbi- vortec conversion. also you will need to get an egr valve, tube & manifold from a 96+ at a junkyard. a 350 with vortec heads makes quite a bit more power and torque than a regular 350 tbi. you will also need bigger injectors from a 350 and a different prom chip. i would get an aftermarket chip calibrated for the new engine.