Chuck2213,
I’ve got a 51, 3100 that I installed the Bitchin Sheetmetal Products radiator support and inner fenders on. If you only used the radiator support we may be comparing apples to oranges but In my case it worked out great after some fiddling. With the combination of parts I used the radiator support had to be slid pretty far up on the frame brackets to get the correct spacing at the hood to cowl area. As you mentioned, your does look wider than an 1/8” in the pictures.
I’ve only done this once, so I’m not an expert on the alignment of the hood and fenders but I think you need to get your grill in place (loosely) to orientate the fenders better.
Are the hood and driver side fender after market parts?
