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I have found the opposite....you can abuse the hell out of them without damaging internals. I've even dropped an apex seal in a burnout comp, but still entered the drags in the afternoon, won my class, and then drove the car an hour to get home. It became smoky after the burnout, but I didn't know what the problem was till I pulled the engine down and found the damaged seal and a large groove in the rotor housing. That was on an engine that took constant abuse, overheating, over-revving, everything for 4 years before it finally went. I was pulling somewhere over 11,000rpm when it went.

The reliability problems are more to do with them needing to be perfectly tuned, and not wanting to ####ing start!!

Hey when you did the conversion did any of you modify the diff? any thinke else like that..

Umm, yes. Everything was modified. I can't really advise you on what you need for a 1200 because mine was a 1600.
It depends on what motor ur putting in. If its just a standard 12A or something, u could just see how long the diff lasts. That might give you a few weeks to decide what diff you use.

the way i did it was i installed a taller gearbox tunnel, then sat the 12a in with a series 1 rx7 5 speed (because of shifter position, needs to be a forward shift otherwise the shifter hits the handbrake) and made up custom engine and gearbox crossmembers. the engine mounts were mounted on plates which were welded to the chassis. i also used a rx7 radiator and oil cooler and i modified the radiator support to fit it. car drove good and stayed cool, real fun to drive. it's a worthwhile conversion because the 1200 motor standard is dead and you can pick up whole rx7 fairly cheap.