I'm in the process of replacing cab supports, outer floor, rockers, floor well and ect on a rusty 66. I've screwed or tack welded almost everything with excellent results except the rear floor support. It doesn't match the inner rocker when flush with the floor.
http://s1211.photobucket.com/albums/cc428/bigblock-454/If I bend the inner rocker (floor) to match then the B pillar bottom will need to altered. The B pillar bottom that
I replaced matched the org metal very closely. Any ideas