In the Model B portion of Doug Roe's Rochester carb book (first printing) he mentioned that some of the earliest model Bs did have some problems with their airhorn castings warping, But he says a design change corrected this problem and subsequent models were trouble free. Having never had this problem with the several model Bs I have owned (all passenger car '54 and later), I would think simply sanding the gasket surface flat would be sufficient. How much do they warp? Never had a Carter YF, only a set of YHs and some WGDs, I think they are all a related design that uses metering rods and diaphram accelerator pumps. I like the metering rod system but am not a fan of diaphram style pumps. Over all I would prefer the model B (but I just dont like their nasal sounding part throttle whistle when used with unsilenced air cleaners). My two cents.
