750 vs 850 vs 950 Holley

1.5" hg correct or 20.4" H20 right? J.Rob

Converted 1.5" of mercury to 20.4" of water for testing on the bench.

The 750 HP/XP is one of the best all around carbs for small blocks from 350-400+ cubes I've found. J.Rob

Agreed. The only thing I don't like is the high location of the idle fuel restrictor jet, but that can be relocated.