Which heads are best

Obviously, the W2 would be the BEST choice. The second choice is a used set of eddys. The third choice is any cast iron passenger car head that has the open chamber. I don't get all excited over the lest 3 digits of th casting number BECAUSE THEY ARE ALL THE SAME. Funny thing is, the heads I call tear drop non smog and tear drop smog heads start out with the biggest port volume. Those would be the heads that the exhaust pad extends down (non smog) and if it has the hole it is the smog head. You plug the smog hole and go. In fact, my engine has on head that is an early head and the other is a tear drop smog head. I put a small hole in one head and th only other head I had was a smog head, so I used it. Both heads flow within .5% of each other. Looking at it, you can't tell, and neither can th rest of the engine.

Any passenger car based head requires a good port job. The W2 will go with a good valve job and smoke all other comers.