Answers: i own a toads timeless restorations, we do hotrods, classic cars and custom work like this adjectives the time.
you need to method the frame from front to back ( it can be longer )
consequently measure from the center of the tiller openings, and later measure from the center of the axles, the width from the axles can be bigger as you can move the rear axles forewords, you will hold to make your body mounts, as the body's on those 1946s have wood between the body and the truck, but not a big deal, and you will hold to make up modern bumber mounts as well, newly take the older ones and make next fit your frame.
if you need more give a hand with this in recent times e-mail me at hotrodtoad69@sbcglobal.net sick help you as much as i can.
apposite luck and i hope this helps
More Auto Questions and Answers...
This article contents is post by this website user, AutoQnA.com doesn't promise its accuracy.