I went through some Carter brochures and came up with the original jet/rod combos for the '68-'71 AVS' used on 383s(630cfm) and 440s(750cfm). Comparing these to the Edelbrock out of the box carb jet combos I can see why folks are having trouble dialing these in. First off I'm setting up a '70 383 Magnum 4 speed Super Bee. Stock intake, exhaust manifolds, TTI 2-1/2" exhaust w/ dynomax turbos, MP electronic ignition.
I set up an Edelbrock 1405 (.089 primary,65-52rods,7 lb. springs,.095secondary, .028 pump jet)and 1411 (.101 primary, 67-55 rods, .089 secondary, .035 pump jet) to see which would work best for my situation. I used the jetting/rod combos from the original AVS' and had a little trouble dialing in the 1411 so switched to the 1405 with a ported wood spacer(Edelbrock 8723) and am very happy with the results. Plenty of low end power and torque which the 1411 wouldn't deliver on my 383. Wish I still had my '73 New Yorker to mount it on, the Thermo Quad on that 440 was so full of emission junk it never had any power. The 1411 is up for grabs. Anyone wants one pm me.