Definitely run a few hundred miles with the stock distributor if it is known to be good. EFI is a major mod and should be done with no other changes to muddy the waters.
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 70 GTO Restomod -- 400/200-4r, nothing to see here
70 Firebird -- 455/400
69 Mach 1 -- 390-C6
07 Escalade EXT
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