I hoping to find a 91-93 short box pickup and the frame shouldn't need to be altered at all if I'm correct. If I have it figured right, I should be able to remove the cab and box and then start working on the cab floor fitment. I'm guessing that the cab and box mounts might even line up. I don't have any extra doner vehicles so I'll only have one shot at getting it right. Actually, I don't even have the donor vehicle yet. I do however have a new, 2004 5.7 factory take-off engine, leftover from a previous project, laying in reserve.