My viewpoint is somewhat in contradiction to Jesse’s.

Brads motor made close to 700hp from 452 cubes with std port Victors that didn’t recieve any extraordinary reworking, with a 4150 carb and an ootb intake.
Still had a low tech Hemi pan on it as well....... no vacuum pump, no gas ported rings.
It also had an easy-on-parts cam in it.

I have no doubt that same basic combo could be tweaked to find another 20-30hp without doing any more work to the heads.

The way I look at it....... how bad can they be?
350cfm from a true std port head with normal porting.

They don’t need to be the best head ever made, or the easiest to use, or the best bang for the buck....... to still be a decent head.