414 Dyno results: Missed combo?

The venturi on this 750 is already 1.375"--How much smaller would you want to try? J.Rob
Just for chicks & jiggles, an off the shelf 650 double pumper, jetted accordingly of course. That is basically a 750 body w/an 850 base plate, how responsive to jet changes
was that unit? Oh, & I'd still like to see a pull w 1.6 rockers on the intakes :D!