[snaptwo]

I have a first hand knowledge of the Chevy/Pontiac interchange. I bought a totaled '56 sport sedan about 40 years ago. It was T-boned in the center post on the pass.side. Before removing any bent sheetmetal, we hooked a damage dozer in the center post area and pull some of the floor/rocker/center post to where it was close although bent. I the used a section of floor/rocker and center post from a '57 chevy sport sedan and the doors from a '56 Pontiac , yes the moldings were different and I had to change the trim pads but it all fit. Seems to me I also used the Pontiac headliner and trim on the Chevy.