It’s a 508 with std port Ede heads and a std port intake.

It’s not going to peak at a very high rpm no matter how big the cam is.

The main hurdle with those heads is coming up with enough installed height to fit a spring big enough to allow a cam that’s fast enough/big enough to make much of a difference than what’s posted, or the current cam.
The other issue is with the “big springs”, the integrity of the fairly small rocker stands would be a concern for me.

My guess is, there wouldn’t be too much difference in power from different cams with similar lift and duration, if they are all designed to operate with what is a “typical” spring used on those heads.