Porting 302's

I know there has been a lot of talk about these heads on here, both good and bad.
With all else being equal, same car, same engine, same gear, tire size, carb, intake, exhaust, cam,etc.... would there be a noticeable improvement on a 78 318 in a that now has #163 open chamber heads
Talking about adding a set of 302s, "just bolted on" without the porting? Talking cruiser car, 3 season daily driver, only mods are lean burn delete and true duals to the back bumper vs original single exhaust?
Said heads fresh from machine shop, "standard valve job" , crack checked, all new (stock replacement) valves, minimal shave just to assure flatness I think the number thrown out was like 0.007" shave.