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Stock header bolt location yes...But far from a stock exhaust port.
J,X or eddie, and pro comp is a stock exhaust port.I wish i could post pictures.



I'm agreeing with you. If he has to retain stock exh. Flange
I would not use the Indy heads
I don't know which would be best. I've seen several cars run great with the eddies




and people should not dismiss the Indybrocks I had a set with there cnc porting 2.05/1.60 valves on a 416 and it was pushing 650hp, car was right at 3100lbs and was running 9.7x's at 138.
and I believe it would have done a little better with a dominator but never got to try one.

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4