ID this AFB

[fulsizjeep]

I thought my carb was a 625, but appears to be a 750 after some research. I just took the seller's word that it is a 625. Mikie is a gear head and this came off a 66 Fairlane 390 race car and also came with strip kit (metering rod, jets and springs). It had .101 mains, .075x.052 metering rods and .080 secondaries.

I am having some trouble getting it to feed steady through the mid range. I currently have .092 main jets, .068x.042 metering rods and .089 secondary jets. The accel pump is new. It may just be a bit too much carb for my 401 setup. It screams once you get past the stumble and idles real smooth at about 700 rpm.

?Any thoughts y'all? This would probably work better if it was a 625?

These are the numbers on right side front flange: 9755 S 0725

I found this info:
Carter Carb Info by Dan Jones

To determine Carter AFB carb flow, measure the butterfly bores and use the table below:



CFM Venturi Diameter Bore Diameter
primary secondary primary secondary
--------------------------------------------------------
400 1 1/8 1 1/4 1 7/16 1 7/16
500 1 3/16 1 1/4 1 7/16 1 11/16
575 1 1/4 1 9/16 1 9/16 1 11/16
625 1 3/16 1 9/16 1 7/16 1 11/16
750 1 7/16 1 9/16 1 11/16 1 11/16


9000 Series AFB Code Deciphering

Base part number is 9000 and the last three digits refer to flow rating. For example, 9625 is a 625 CFM AFB carb. Adding 0, 9625 means it was set up for a Chevy style linkage, adding 1, 9626, means it is a 625 for a Chrysler, adding 2, 9627, means it is for Ford; adding 10, 9635, means provision for EGR.

If the carb is an aftermarket version, it will have a 9xxx cast in the front near where the mounting stud goes through.