Love the YF. I should have done it years ago. It is much smoother operating then the Rochester BC I had. Maybe it was just my particular carb, but it had a bad mid-range lag. Anyway the YF is smooth up to as fast as I dare to push it. The only drawback is it seems to use more gasoline than the Rochester did. It is worth it to me, though.

-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's