slant 6 carb?

Yes, it was a Holley 1945, but it was a special one. It had extra-lean calibration, a vacuum-operated idle speed stabiliser, a smaller venturi, and the same small 1-9/16" throttle bore that was used on pre-1967 170 engines and various taxi-spec Slant-6s rather than the larger 1-11/16" bore used on non-taxi 225s and '67-up 170s.