How to tell --- The first bed, look at the front panel that is up near the rear of the cab. It will be straight across and lower than the sides. The second bed, that same panel is arched up in the center to about level or above the sides, plus wider and many detail differences.
Wecome to the Barn! With that many restorations under your belts, will you have questions for us is the question. Stay in touch and post more pictures, we like pictures
I have attached two pictures of the bed regarding the question of whether or not it has a regular or wide bed. From the earlier description, by 100IH, ours appears to be the standard bed, correct?