I'm working on a similar project /forums/images/graemlins/grind.gif, a 54 Willys PU on a 79 4x4 short box frame. Start by measuring the wheel base of both trucks. If the wheel base is close your can move the rear axle back, or move the front forward by using direrent springs and moving spring mounts. With the number of different frame lengths in the chevrolet truck line you should be able to come up with a frame to fit your 54 body with out having to section or lengthin your frame. Once the wheel base is worked out it's just a matter of finding the right gas tank, radiator, wiring harness, headers, brake system, steering colume, etc. etc. You know all the easy stuff. /forums/images/graemlins/hack.gif
Good luck! /forums/images/graemlins/peace.gif