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A couple of initial thoughts: I gather from your mention of replacing the wooden frame rails that there is a good chance that the body may be off of the car and the frame rails exposed. If so, it should be a fairly simple matter to run a tape measure diagonally from a corner from front to the opposite rear corner to verify that the frame is first not pushed "out of square" so to speak. From there, placing a metal flat edge (like a long metal level or even a piece of metal strip) will show if the frame rails are straight. I've seen frame dimensions in some of the various Model A reference books, (not sure which one(s) at this point, and possibly someone else may have a reference site, but ... ) and these could also give you an indication of whether the frame has been bent out from the center. I hope that this helps - good luck with your project regardless.