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1996
Late 1987.
intake manifold
NO it will not. You MUST have a 1983 ECM/computer that is programed for that make a model car.
tuned port injection
There have been millions of cars and trucks produced with a carbureted 350. every Chevy that offered a 350, before fuel injection any Chevy model that offered a 350 cid. engine before fuel injection.
As long as the 350 is a fuel injected engine / TBI / Throttle Body Injection engine there is NO difference.
0.035" gap
With the Throttle Body injection and a TBI intake from Edelbrock for vortec heads yes it will work. If you mean using the vortec injection with the TBI electronics then no it will not work.
NO. There is alot more to a 98 350 then just fuel injection. That year truck MUST have ALL the electronic engine sensors on it and working are the transmission will not even work. The 76 350 has NO place for the engine sensors to go. So it won't work.
engine will fit, but 305 tbi will be too lean for 350 It'll burn up
Sounds Like You Are Out Of Time. Most Likely Timing Chain.