very nice car and pics andy ! i have always admired your work. bow
as gus mentioned, have you tried that adjustable [and rebuildable] PVC valve ?
i have two of them for my two projects [bought when we had a group buy] , but i haven't tried them because the engines going in them are no ways near built.
if you had a stock PVC valve, the adjustable one may be something to try. on the other hand, if indeed you DID have the adjustable one, and it was giving you problems, why do you suppose it didn't work with your EFI ?
beer