gotta treat it like a convertible
find a service manual //to get your measuring points or a frame rack...
I would measure and see if it is SQUARE//block it up//recheck//start with making a set of sub frame connectors/square the door frames with tubing and get busy with those rockers and floors to tighten that puppy up OR if you are racing, roll cage it and tie everything together...
that is a cool ride I'd 340 it //"ramduster"-"cuda-up":lol:
