About the only problem I could see would be prolonged inverted flight without a flop tube and inverted oil system. My -6A is certified for a limited set of maneuvers: loops, rolls, etc. I had to submit the list and then they had to be flown in the 40 hours before being legal. Since I'm not an aerobatic pilot, I got my test pilot to do them. I'd expect that if you request if of the FSDO as Mel said, then they will amend your limitations with the proviso that you will have to fly them in Phase I before returning the plane to Phase II.