Im looking for some technical info on a 292, so any Y-Block guys that can help please chime in. So, Im looking for a 4 bbl intake for my 59 F100. im wondering why the ECZ-9425-A is so readily available? I also know that the ECZ-9425-B is the most desirable 4 bbl. So whats the difference, will the A except a typical 4 bbl carb 4 bolt flange? Is their any reason to not get the A?