In my somewhat informed opinion, I would say as long as your engine was rebalanced as an assembly, you should see no issues.

I am ignoring the fact that your Nissan has Pistons the size of garbage cans and causes about the most torsional stress in the crank that I have ever heard of, LOL.

Seriously, talk to your builder. He knows the rpm the engine is balanced to and the maximum recommended rpm he expects you to go to. You can get away with it for a period of time, as all companies build a safety margin into their motors in strength, but it is a bit like Russian roulette at some point you luck runs out if you exceed designed in operating forces.

Heck last year a co-driver in my car missed a shift and pulled 10,300 RPM. Engine still runs fine, but I expect its life to be much shorter now.

Eric