Did Chevy ever have a flat head (not considering Buick and some of the other cars) just Chevy cars and trucks, flat head or not?

If you had the proper gears and or transmission then a 235 overhead valve six cylinder, or the 261, and probably even the older 216 will get you to 55 mph.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-