I looked into this years ago. Not such an easy task. This was going with later model ambulance doors on an older tub.
Just off the top of my head I recall the main issues being location of the hinges on the body, area for the striker plate in the tub, as well as issues on the hard top with where the bracing is for the lift gate on older tops vs. ambulance doors.
I think it would be much easier to put early model swing doors (1/2 height) on a new tub with say a soft top than trying go the other route...especially when the hard top is involved.
Jeff Z. (the "not quite as skinny" one)
'97 FZJ80 Antique Sage AE #267, stock
12/74 FJ40, 2F, SM420, 4" Lift, ARBs, 33" MTRs
"...anything else i can do for you guys, how about i wash your car or mow your lawn while you figure out your firewall system? I am now boarderline insane/unibomber." Kipper
"That assumes I'm even capable of pulling and stabbing..." Jacket
"I really like having a detachable unit." Beater