This is about a gap between the frame rail and the splash pan from the cowl to the grill. I came across this when building my fenderless highboy way back at least ten years ago, and reassembling it again just last week after reinstalling the tranny. This gap is tapered from the cowl going forward from about slightly more than 3/8" to about 1/4" between the frame rail and the splash pan. That is IF the rear end of the pan is mounted flush with the outside of the cowl which I just have assumed is the correct factory mounting. If mounted to the rail by bolting right to the rail, then the rear end of the pan is not flush to the outside of the cowl, and is then inside the cowl by something close to 3/8" or 7/16". When mounting them the first time back in the dark ages, I thought something must be wrong here, (I did not pay that close attention when taking it apart). I measured to see if maybe the frame had been pinched somewhere along the line, using the Wescott frame drawing, but it had not been. I had replace the pans because the pans that came on the car were butchered beyond salvation, so I checked the replacements to and against the ones on the car which I have to believe came with it when the little Ford was new. The replacements checked out to be the same configuration, as far as forming was concerned. So in order to fare in the rear end to the cowl outside surface I ended up making spacers and using them. The gap is not visible unless you look for it, and it does not bother me. I have always wanted to ask you guys if you know about this, or any thing about it? It is pretty hard to get a picture of it, but if needed I will give it a try, but won't promise good results.