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So the only difference was the bigger intake valve?

I have read in the Mopar Performance speed secrets book that the best combo of exhaust manifolds is the passenger side 68-70 and the late model magnum drivers side. The magnum drivers side manifold flows better than the 68-70 one and the pass side 68-70 flows the best. Its a combo that Mopar...

The first one they made, the older one.

Edelbrock torquer is a piece of crap, I tried it at the track, did 2 runs and loaded it up on the trailer, no good for nothin'. Worst intake ever made, in my opinion.

I would have to agree with having your iron heads ported. You can do a lot of work to them and get good numbers for way less than the eddies. I also remember reading a post here a while back where one fella actually went a little slower with the aluminum heads. Hard to believe but with the loss...