I found a 1990 Chevy Silverado truck,Reg Cab-long box. It has running 350 and good trans. I was wondering how much longer the frame was, and how hard it is to shorten a frame,and what has to be done to shorten it. I want to put my 1949 Chevy 3100 Cab and box on the 1990 Frame so i have a reliable motor, and disc brakes.