This is the first 360 I have torn down. I bought a 70 AMX this fall and started restoring it. The manifold is an Elderbrock Performance it has a baffle under it that is to deep and someone cut the valley pan so it would fit, is this some old school racing trick or did it come with a baffle? The intake has a pcv valve non egr. Also are stock pistons flat or raised with valve relief?