1937 Buick track was 58.31" front, 59.25" rear. Special wheelbase was 122.0", Century wheelbase was 126.0.

A good match from the track standpoint would be the '78 to '86 Monte Carlo, Malibu, El Camino, Olds Cutlass and Pontiac Grand Prix at 58.5" front, 58.8" rear. These were full frame cars and while you would have to add some material in the middle somewhere to reach the longer Buick wheelbase, you'd have modern suspension and steering and the motor mounts would be in place to accept a small block Chevy.