My .02, I think the best option would be the aluminum Magnums. Small chamber, not too large a port, and able to keep the power up past 6K. I think for a fairly mild 318, anything more is going to feal sluggish down low.
But the port size is the same as the commandos, and stroker even said that he wasn't going to be going over 5000 rpm's too often, so why would he be in need of such a large runner head. Is it because of the material they are made of and they would be neet to have.
I don't understand why you would put a head on a engine that is capable of 8500 + RPM's and then turn it 5000 a time or two. Now if he was going to build a 408 then the head would be fine and more useable to the rpms of the engine, but IMO it's way too large.