Need help with edelbrock 1406 carb

RustyRatRod said

It's not just the jetting and rods with those. It's everything. It's the boosters as well. There's a thread around here somewhere showing just how many differences there between the 1405 and 1406. People can flip and flop it and argue it however they want, but the two carburetors are vastly different. It's been well documented.

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That is correct, but my point is that tuning is required no matter which car brand or type used to get optimum performance. During the '76-'77 gas crisis, i changed the cam in my 340 to a 318 cam, tuned the AVS to perfection (leanest AFR for power) and used 2.94 gears and 28" tall tires. I got 24-25 MPG on drives from LA to SF or the like and actually went from South SF to Irvine, CA on one tank of gas. ~400 miles. The car still turned 14.50's at OCIR with this setup, so it was no slouch, but down from 13.50's stock.