whats the best source for 66 carter rebuild kits?
everyone is allover the place. are 66 different than 67?

I’m all ears on this

Probably check with Harm's.

1966 and 1967 Hemi carbs are basically the same, any decent rebuild kits, not the cheaper ones , should work fine

The Kit covers 66 thru 71 hemi and a few other AFBs. The issue will be the quality of the Accelerator pump in the kit. Hemi used the Carter 64-212 like most Chrysler AFBs of that era, and the aftermarket went generic. The other difference is the needle and seats. Most are .110. Hemi like Chrysler AFBs used .1015 #38 seats. So the fuel level can wind up being higher, for the same fuel pump pressure/float setting. Larger needle area means the fuel pressure exerts more force against float fulcrum which means fuel level will go higher to exert enough buoyancy force to keep needle closed.

SMP might be a little better than the walker kits I have seen. Can't speak to some of the custom kits on ebay. Can't be too many manufacturers making their own parts anymore.

Pay attention to the gaskets that come out of your carbs versus what you put in the carb. The kits give you all the options which is why the kit covers all years. 66-67 use the older style secondary venturi gasket. The newer ones are included for the 68 up.