best carberator for the stock slant 6

I recently got a 64 Slant Six with the Carter BBS. Long ago I had a Slant Six with the Holley 1920. That Holley drove me nuts. I suspected my problems were something else until I finally got a good 1920 carb (after ~3 others from auto parts stores).

The BBS looks like a smarter design. It is very similar to the 2-barrel BBD that was used forever by Mopar on the SB and finally on the Slant. The 1920 has a side fuel bowl that often leaks and you can't "pop the top" to verify the fuel level like you can in the BBS.

Much of the internals in the 1920 are sealed so you don't know what might be stuck in there and rebuilders probably don't rebuild those. It has a diaphragm operated "economizer" rod that is probably harder to know if it is working. It appears that the "metering rod" replaces that in the BBS and it seems you can test that better.

I am sure others will chime in with better info. My impression is that the 1920 is a cheaper and more problematic design. My 64 sure runs smoother than my 69 ever did, except with the final 1920 carb that actually worked.