Here's my setup I have an 86 Firebird with a 79 350 out of a Chevy G20. It has the vaccum advance distributor and the quadrajet carb. With wideopen acceleration it hits about 4k rpm and it's like the car stalls and the rpms drops off until they come down to about 1k. It's almost like an electronic rev limiter kicks in an FI car. I'm thinking it's either the fuel pump or in the carb.