Problem solved....turned out to be the wiring on the duraspark. I got the wires crossed.
The good news is it was a 30 second fix....after spending an hour and a half last night going over firing order and rotor phasing....
Ok, I feel a little stupid, but I'm so glad to have the 5.0 running with the windsor jr. heads on it, that I really don't care. These heads sure work good with the roller cam.
Can't wait for this weekend and the chance to really tune it out. At least the drive to work will be more fun now.
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66 GT Fastback 5.0, 5-speed, cable clutch, JBA's, 3.40 gears, EFI coming soon?