Best Bang for the Buck Head???

Stock X or J heads flow ~200 cfm, fully ported by a pro ~ 250 cfm.
Stock Edelbrock's (non magnum) flow ~245 cfm, fully ported ~293+ cfm. The magnum version flows a little better.

I would go the Edelbrock route because it gives room to grow, and will be noticeably faster than stock heads (even OOTB)......AND pulls LOTS of weight off the nose of the car, what's not to like?

For what its worth, I have ported Edelbrocks on my street/strip Barracuda in a relatively mild small block stroker combo (10.8:1 compression, 93 octane pump gas, 750dp carb, small roller cam)...it run 10.70's, is SUPER reliable, and can be driven all over town (and IS driven all over town :D ).

My point is, if you want a fast car, spend some money on GOOD heads that flow well. Both RHS and Edelbrocks are good choices, I just prefer the Eddys for the weight savings and for being able to run a little higher compression without detonation (thanks to the fast heat dissipating properties of the aluminum).