Duck, all engines have their limits. 11,000 rpm on a 750 twin with that bore stroke ratio is a darn strong motor. Keep in mind that oversquare engines have large pistons with correspondingly increased inertial loads when they reverse direction.
The engine needs to last through the passes to get a license, probably a bunch more to get everything sorted, and a down and return run. Also, the salt can be slippery and you will lose traction or the gearing can be miscalculated, and the engine will be running at higher than intended rpm. The LSR state of tune is less than for drag motors for these reasons.
A way of approaching this is to develop a good data collection system and accrue some baseline information from actual use with a milder tune, such as engine inspections from periodic teardowns, and exhaust gas and cyl head temperatures. Then, incrementally tune for more power with an eye on the data you are collecting. Also, master the turbo and the nitrous separately before you mix the two.
The numbers you have for HP are pretty high and might not be realistic for LSR. Also, personal safety worries and concern for others at the event, especially the insurance we all pay, means it is best to approach the limits from the safe side. It might take five or more years to get all of the potential out of that engine.
