Kuno, this will not really help, but my first ever car was a 1937 Chevrolet sedan with the same basic engine as your inquiry truck.
I can safely say that it would do 75 mph as I received a speeding ticket as a very young boy with that very car..
I am quite sure that your truck example, with ordinary tyres and on good road surfaces would be capable of at least 50-60 mph.
While totally off the subject, my only experience with a military vehicle on desert terrain was when I took my Volvo Sugga down to the tip of the Mexican Baja Peninsula in the early 1970s.
It had non directional tyres, a very strong 6 cyl motor of about 90 hp. and was capable of 80 kph on the "highway".
Going on the dirt roads that were available at the time, I could average maybe 35-40 kph. When I had to cross dry lakes (Wadis), the speed would drop to 10-20 kph. It was 4WD, so I never got stuck but I came close a number of times.
Just a little historical footnote.
Bill
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