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I agree with John. The C, E, G, and Ga heads are all good castings. I believe the J heads are also fine for a street motor. I have heard that they drop off at about 3500 rpm. A BBO won't be revving that high very often anyways.
You can also purchase big valves and have the heads machined to fit the valves. I put a set of aftermarket valves in C heads for Oldsguy when I was in college. I believe they were 2.10 intake and 1.71 exhaust. I am sure Oldsguy would remember for sure. He is still using the heads in the 46 he is putting together.
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