Don
I put my 46 PU on a 76 1 1/4 ton army issue GMC 4x4 frame with a 350/350 combo. What I did was widen the fenders 4 inches each. Have a look at my photo album ,one of the folders contains the pics. of the cut
Stuart
http://pg.photos.yahoo.com/ph/sublime589/album?.dir=d9d2&.src=ph&store=&prodid=&.done=http%3a//pg.photos.yahoo.com/ph/sublime589/my_photos