I'm interested in swapping my stock cast iron quadrajet intake for an edelbrock performer rpm one. Engine is a stock 85 model 454 with peanut port heads on it. Looking at the edelbrock manifolds, you buy either one for oval port heads or rectangular port heads. I realize the peanut ports are a small oval port head. Can I run the edelbrock manifold with the heads thats currently on my engine? Will it run better than the stock iron intake? Thanks guys.