https://www.google.com/?gws_rd=ssl#q=gm+heritage+1936+chevrolet+truck

Click on the first result pdf 1936.

You will find a graph saying top speed is 75.
You will also find a page that says max rpm is 3,800, and that for every 50 rpm you will go 1 mph. So 3,800/50 = 76 mph.