I think yellowrose is probably dead on here. There is only so many times you can check the cam and distributor timing out and confirm everything is correct. Going to have to look more closely at that EFI system. Being that it was on power tour, I would be inclined to check the fuel filters out first. It’s all too easy to get a load of gacked up gasoline when your out on the road, a newly built service station is always the worst to get water from. It may just be an incredibly unlucky draw on the scale of a drag week event instead of the more leisurely power tour. Just hoping for the best at this point, I cannot even imagine the frustration this one has caused.