I purchased a 1953 M38A1 awhile back. It had a Carter YF carburetor when I purchased it, the YF is standard on commercial jeep F head engines. My YF leaked a little, and ran a little rough. So I found a Carter YS 950 at one of the California meets, and had it rebuilt by a competent carb shop. So I take off the old Carter YF, clean everything up install a new gasket, and then go to install the new Carter YS 950, and the float bowl on the YS 950 bangs on the engine valve cover and will not sit flush on the intake manifold. I have to be missing something, and I couldn't find anything on this in the TMs so I'm raising the white flag. HELP!