Does this sound right

Possible.

428 X with a 686 lift Batten heads carb 950 peak power was at 7200
416 R with a 686 lift with indy heads carb 1050 peak power was 7900

The cam only plays a partial part of peak power.
I Get that Indy heads are obviously bigger than an Edelbrock head, etc.
And that they will move the power band up. I also get that the cam is far from the only dictator of where max power is. But it is a factor.
My point was, the small cam is going to act as a governor to where peak power will get made.
6800 just seemed higher to me than I would have thought. Indy head or not