302 heads

So I'm getting information ready for my engine rebuild. I want to install a set of 302 heads on my 273, but i got to find a set first. What identifying marks are on them to know i have a set? Which cars did they come on? Pictures? And what truly makes them so superior?

I also am looking for a set of exhaust manifolds that were on the Dodge Dakotas, but don't know what years would fit my 273.. I should probably make a separate post about that however..

thanks, you guys/gals rock