Been having nothing but problems with my lucas k2f mag on my 58 pre unit and are looking into upgrading to a hunt or morris mag. It has a single amal concentric with a TR6 head. Any pics I have seen with a joe hunt on a pre unit has been with the upswept intake. Im thinking maybe the top of the mag would hit the bottom of the float bowl. Have seen a few pics of bikes with a Joe hunt and single JRC carb which seem to be quite a bit shorter, but would like to stick with the amal. Anyone run into this before? Would like a bit of info before shelling out for a new mag to find it wont fit.