47-55.1 1953 Chevrolet 5 window - Narrowed Frame

[Mr Chevrolet]

Hello, I recently purchased a 53' Chev 5 window pick up. The truck is really solid and I'm trying to plan my design. Initially I was going to put it on an S10 chassis (which I have) but after seeing the truck, I think I might want to keep it on the stock frame. I'm now thinking of a bolt in Mustang 2 front crossmember and possibly narrowing the rear frame to accommodate a larger rear tire. Has anyone on here narrowed the stock frame? I don't want to put a rear clip in it, just want to modify the original and put a narrowed rear end in. I'm thinking like a 15" x 12" wide rim. The truck has to sit low as well. Any help would be appreciated. Thanks.