4/7 swap in mine. Had a dual plane first and it seemed to run ok for that season. Next season went to FAST 2.0 and ended up changing to a Northwind. Single plane seemed to wake it up in low end all the way thru top end. Happy with how it runs.
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 1967 GTO, 467 roller motor, e heads ported, tremec T56 magnum 6 speed and
9" done. EZ EFI 2.0 with FAST dual sync distributor and separate nitrous system done. Track is at 4300 ft elevation. so far a best of 11.95@116. Suspension now getting dialed in...tubular front a arms with dual adjustable coil overs HR Parts n stuff rear bar and whole car lowered 3 inches..
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