If you already have both sets of heads, send the Edelbrocks to Brian (OU812) and have him port them. Best of both worlds. Or the iron heads, which seem to be a favorite of his.

Point is, this guy is a professional who knows his way around a smallblock head.

Beehive springs allow one to use a smaller retainer which takes mass out of the valvetrain, also the shape of the springs makes them less susceptible to harmonic vibration and one can usually use a beehive with a lower seat and/or open load.
Comp Cams really put the idea on the map.

R.