Carburetor Issues and Recommendations

[DaveVA78Chieftain]

If you puchase the Dodge Service Manual from our site store you will see the original carb was a 4 barrel Holley.

[Wildman5977]

gas fouled, brown hard clumping around the electrodes from excessive fuel, rather than the black oily/greasy from bad control rings, and little loss of oil from crankcase   

[Wildman5977]

I have the dodge m500 service manual on disk, it shows both the carter thermoquad and the holley

[Rickf1985]

Thermoquad has a phenolic plastic center section. Pretty distinctive.

[mattyj858]

 Pull the air cleaner off and clean around the side of the carburetor, the model number should be stamped on the side.  If it is a Carter it should be quite visible

[DaveVA78Chieftain]

Real simple to determine what carb was used where
In the service manual, refer to the spec pages at the rear of Group 14 - FUEL SYSTEM.

318 - Carter BBD 2 barrel
413 - Holley 4 barrel
440 - Thermoquad spreadbore