Hey Brian, thanks. I recently finished sorting out, re-calibrating (based on a fellow's mild 351W), and rebuilding a LIST-4779-2 750 double pumper. Here are some modification detail pictures and what all I put into it based on the engine combination, that should work very well... the bravery to "molest" and dial these suckers in really is worth it and rewarding with how surprisingly well they'll work, both for rock'n'roll power production and better fuel efficiency than imagined possible.
Primary metering block idle feed restrictions drilled out and tapped for adjustable 6-32 brass set screws drilled for feed restriction size, and primary power valve channel restrictions drilled and tapped for adjustable 8-32 brass set screws drilled for feed restriction size ...
Primary idle air bleeds drilled and tapped for adjustable 8-32 brass set screws drilled for bleed restriction size ...
Primary idle feed and power valve channel restrictions in place...
New cup plugs up top after all mods of block and wells cleared of any potential debris or drilling nicks into wells...
New sized and adjustable primary idle air bleeds in place...
... and it's good baseline calibration (better suited than factory Holley calibration, for a stock/mild street engine/vehicle) for starters...
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