Im going to go with a set of Edelbrock aluminum heads, and also one of there performer RPM intake manifolds. I have been reading many upgrade tips on the 390 and both seem to be popular. I glad I got that clarified. So if I change over the pistons, intake and give it a double pumping holley, I should be up around the 320HP mark? Of course I'll be doing more than that, but I want to have at least a 300HP baseline. Any modification tips would be great. I have an expanding budjet.