302 heads reputation came from a Mopar Performance build where they built a 9:1 318 using a .450 lift cam and started with 360 heads for about 275 hp. Then they swapped the 360 heads for some ported 360 heads for +30 hp making about 305 hp. Finally they swapped the 360 ported heads for some ported 302 heads and went from +30 to +55 hp. I heard here that those heads were ported so far, that they did not last the dyno session. So with 330 hp from a 9:1 318 the ported 302 heads became the thing to have. As we can see here, nonported 302's not so much.
