Hello- got a 1949 GMC FC102 and I'm planning a new shop. Having a time finding bumper to bumper length and overall width of the truck. Can some one point me to that?

From your view of building a shop for this truck woukd it be better to have a 20'x20' or 18'x22' or 16'x24' ? I'm limited to 400 sq ft by city code. See any advantages to either size. I plan to use 30% for yard equip and other stuff. Thank you for any assistance.