I'd be less concerned about the wheelbase difference than the width of the axle. So what if you need to shorten the axle. It's a fairly simple process.

I don't know the width of either, but I do own a pair of '72's and a stock '53, and I imagine the '68 rear is too wide.

Jeff


My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton