I run a set refreshed by Dwayne Porter as well. Great to deal with, very well informed and extremely experienced.
I would likely go with the CNC'd Trick Flow heads and have Dwayne go over them if I was building a new motor though.
Why are you stuck on the Indy EZ's?
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 3.91's (closest thing to an automatic 5 speed going)