I would think w2's are legal, it says you must have original valve angle and location, that's all? What 2bbl manifold would you use?
I would think magnum heads will be legal as well. I have considered them and have been looking for some on the cheap. What intake would I use then? Can you drill an intake to fit?
I am trying to do this on a budget, funny I know! I have tons of x and j heads laying around as well as early 360 engines. I have talked to some chevy guys and they are going to run vortecs and some lightweight internals, but with an hei and a 2bbl, I think I can at least compete? If not I will just build a chevy and sell it all of and go back to drag racing.