Dyno numbers.

I have the heads been on the flow bench.

Nothing I see wrong with heads. (Like to change valve job just to see)

I have not said much about this deal but let's get the facts out

Rods chambers 4 cc larger than other heads almost .5 point of CR

Valve lash was not the same for both heads on the dyno print outs that I have seen.

You opened up the end of the intake (big mistake IMHO)
This changed the taper of intake.

Why 6° timing difference in the Engine's?
Chambers are about the same plug locations the same.

This engine should have been run on pump gas no race fuel mix

I believe loss of compression plus race fuel mix and wrong cam IMO contributed to the increase of timing