Rebuilt 302 casting heads available through Rockauto
The 302 style head has its place.
If I were putting a 273-318 together with a target of say, 300-325hp or less........then I’d be okay with using them.
That being said........ I’m probably just too lazy to go about it that way.
I’d just find a 360 short block, and then all the aftermarket heads work just great......... and I’ll end up with way more power for the same effort and $$$.