'69 Firebird Convertible Project.

[T.K.]

Hard to tell from the pics but from what I can see that isnt enough bracing for a convertible before you cut the floor out. I would have braced that up a lot more and ideally welded it to a table for the work you are doing. For a proT car, now is the time to think about how you are going to proT it. With even a little more power these F-body convertibles flex a lot. THe verts have a bit more bracing stock but you should really look at subframe connectors at a minimum. Me personally, I like 2x4 front to back along the inside of the rockers welded to the subframe in the front and the rear. consider at least one cross member between the two. I like the full inner frame design as used by Art Morrison and some other sponsors but that requires significant chopping and customizing of the floor.

Its too late to prevent the bowing. eyeballing door jams alone really isnt enough. I know you already but the floor in but I recomend doing a bunch of diagnal measuremns to make sure its squared up now before you weld up quarters and more. Dont want to bow the body panels, have gap problems, or worse convertible top dont reach problems later.