[2blu442]

I wouldn't hesitate getting a set of C, E, G, or Ga heads. I believe they could all be cut out for the 2.07 valves if you don't get a set with the big valves already. What I understand, and other guys can chime in is that the heads listed will all function about the same in stock form. The C head casting is said to be able to take more flow work and do a little better than the rest for serious performance. I had a set of E's cut out for 2.07 intakes and I think 1.71 exhaust, then he did some flow work for me too. For street performance I wouldn't spend the money the Edlebrock heads cost. Also you mentioned you were thinking of 400 hp, the 1970 455 4bbl engine in stock form was rated at 365 hp with a smooth idle. I would think a better cam and intake then an exhaust system that breaths well could get you to that 400 hp mark without spending a lot of money. My 2 cents worth, but whatever you decide have fun with it! John