I have the Carter 4133S AFB off of my '66 Coronet 383-4 barrel car due to some trash in the needle and seat. The car runs good on the idle circuit however the secondaries are lean (.083 stock jet) and I suspect the primary could be a little fatter to richen up the transition. We did have really good luck drilling out the factory squirter to .035 otherwise it's pretty much stock sans the orange metering cup springs.

The engine is a very mild .040 over 383 with 9.5:1 measured compression, replacement 383-440hp cam, stock manifolds, etc.

Anyone have a good baseline for tuning the common 575cfm AFB found on many of our muscle cars? It's hard to find parts for tuning these so I figured I'd ask if any of you guys attempted to make one run on a hotter than stock engine.

.089 primary jet
.083 secondary jet
orange metering springs
stock metering rods
.035 squirter, middle hole on pump arm
1/2" composite Edelbrock dual plane spacer for E10 garbage

As I said above it runs pretty good sans a lean spot in the transition and by the look of the plugs (checked properly) the WOT AFR is a bit lean.

Any thoughts/insight much appreciated as always.

ps I have replace the upper radiator hose and clamps lol