porting heads question

you'll need a 1/4 grinder, an inline speed adjuster, some carbide cutters short and long shank-tear drop , almond, barrel shaped work good.

some big, some small so that you are able to get in between the guide and bowl and not have the larger cutter bite in and bend the shank and wreck your head/hands/day.

fwiw those 302 and regular 675 318 heads flow the same stock and in ported form, the only diff is the closed chamber...which some might argue imped's flow