The B series engine is one of the best automotive engines ever made IMO.
As someone who is a keen track day enthusiast ( mainly drag racing) i've had several B series honda engines. My current is a B16A2 with lots of head work and a good re-mapped ECU. It makes power to about 88 -8900rpm
Never had any real problems with gearbox, drives, etc. I broke 1 driveshaft while drag racing on the local drag strip and that was the height of my problems.
How the engine would serve in an aviation application I don't know. Such a high revving engine may not be ideal for an aviation application.