Re: 1951 Ford F1 stock build
Welcome to the Barn!
You can check the frame using a tape measure to check diagonals, from left-front to right-rear and vice versa. Set the frame on jack stands and measure off the floor at front and rear to check for twists/bends. The workshop manual has a pretty good write-up on doing this, and includes this diagram.
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'52 F-1, EAB flathead
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