A non-magnum head, right? You have the X and J heads from the early-'70's or the '89-'92 360 heads with the last three casting numbers being 308.
The X or J heads with the 2.02 valves are the factory ones everybody wants for working over (hogging out/porting) to get the maximum budget performance
The 308's are a 'fast-burn' style head. They actual have been praised as the best 'all-around' factory head by several magazines and mopar engine places over the years.
Opinions vary, definitely read up on both, decide exactly what you want out of the engine, and I'm sure others will chime in.