I've been trying to do some homework and I spoke with Edelbrock tech support about their heads. They stated I would not be able to run their heads due to the spark plug angle interfering with the superstock manifolds.

I'm beginning to think running aluminum may be a problem. Not quite sure if aluminum can support the weight of the manifolds. 440source said there would not be a problem. I calculate about 10.6 cr with the source heads and their 80cc chambers. That is a little higher than I'd like to go! Anybody know if aluminum can support the weight?