commando's vs. eddie rpm's

Stroker mike,you have no mentiono of rpm you intend to shift at or run at,or the engine size,tranny, gears,weight,etc.Both sets of heads can be worthless if you never intend to run the motor past 6000rpm,then you just rework the stock J heads/X heads.How big of a cam do you intend to use,over 525 lift and how much duration?Its no use buying these heads if you run a low lift cam,as most after market heads are making there power from 5-600 lift and turning the motor at 7500rpm.Its best to bobby jeosph at 1-770-443-8874,mrmopartech