The OP needs to fix his tune up. There ain’t a damn thing wrong with that cam and it’s hardly too big. Not even close.
I read the whole thread and I still don’t know how much initial timing it has, what the curve looks like, what it has for total timing and vacuum advance if any.
Swapping a cam is a knee jerk reaction. Fix the tune up first.
And let’s not forget, he has the carb that is bolt on and go, but it’s not. It needs work too.
But let’s all blame the cam.