I've done a ton of research- so now I'm really confused....

Dan the man said
The "302" heads are a good choice for raising the compression. Do not put 360 heads on it as they have big chambers and they will lower the compression, also the bigger ports and valves will hurt your low to midrange torque and throttle response.

I rarely use the red x but 302 heads will NOT raise compression over the stock 273 heads. The compression on those engines in created by the pistons.