Dan, if beer is not involved is it really racing? I think not
Hrh,
The bigger the vehicle you build the slower it will go with the same motor.... that should not be shocking news... just about all the tanks will start with the same aero Cd, the difference will be frontal area. How much you hang outside and how you do it is the rest of the story.
Disclaimer... The Bockscar is not a tank, it is a lakester
The drivers compartment in the Bockscar is 19 1/4 wide X 14 tall, although the driver must go under a bar that is 12 1/2 above the floor at the front of the steering wheel. Yes it is tight, but if you want a lot of room, race a 60s Lincoln
it is not like you are driving cross country, you will be in there about 15 minutes at a time. Yes, I am 6'3 and 215, not a small guy. If you are Pork Pie's size there is almost too much room in it, had a hard time getting his belts right, we did, but it was not easy.
will a flathead fit? don't know, the Kieth Black was a little large for ours