Ideally, if you put the motor on a jackplate, you can run a longer shaft motor, and get the tiller up pretty high, which gets it even more space. But I ran a motor at first that needed to run lower than the transom... and it still worked.

Lousy pic of an unfinished boat but full height bulkhead, tiller motor. Works great. Holes cut for a side console for the future. Part of the reason I'm sticking with these old motors is you can rig them with controls, without necessarily giving up the tiller. I want both.