The 061 heads are actually hidden gems for a 350, IMHO.

First of all, they are open chamber heads with one of the best combustion chamber deisgns. The 1969/1970 Ram Air 4 chamber was patterned after the 061 chamber.

Second, they have press-in studs which is why most people pass them up assuming they are not high-performance heads.

They flow the same as any other D-Port, but they burn as good as Ram Air heads.