I'm planning a similar conversion in my sixty two using 95 ford van seats. Since I have the original seat I'm going to start by measuring the height front and back. Then put my old seat on a sheet of plywood, mark and drill the holes. Next grind the rivits and remove the lower brackets and bolt them...

The six (223) used the smaller clutch. The only difference in the flywheel was the clutch mounting holes so either flywheel could be used or exchanged and a machine shop can drill and tap new holes. The bell housings all contain the rear motor mounts. (Only one in front of engine) The rear had bolt ...