Changing to "modern" wheels could be a problem as Model AAs have stud piloted wheels and modern wheels are typically hub piloted. The two and their hardware do not interchange. On Model AAs the driver's side has left handed threads and the passenger's side are right handed threads. Ford uses...
To get the pan down it is first necessary to remove the sheet metal cover on the front of the flywheel housing as it will obstruct the downward movement of the pan. Held in place with three small bolts that take a 7/16" wrench to get out. Put pan up first and then replace this cover.
The Model AA clubs publication shows 170,391 closed cab trucks were built from June, 1930 to the end of production but it doesn't break it down for soft or all metal tops.