Original poster says he can't reply in this thread. I don't know why. I've asked him to try again, via PM.
Posting this to assure the thread isn't locked.
For the original poster, 92BlazerSport:
Still want to know what manifold and heads you have; 'cause if you're still using the swirl-port stockers, you've got way too much timing advance. If you have Vortec heads, they've got no exhaust-gas crossover, so you'd have to plumb an external exhaust gas tube from your headers across the valve cover to the intake manifold.
As for the EGR, you've said that you "replaced" parts, but not that you've tested to see if the EGR pintle actually lifts when the engine is fully-warm and the throttle is opened.
The EGR valve is a backpressure-sensing type, "I suppose" that major exhaust system changes could alter the operation of the valve. In reality, I've never heard of this actually happening.