Need help with my xr drive please
 

I have an xr drive, and i just snapped my vertical shaft and damaged my prop shaft.
I currently have a 500 efi motor but in the next couple of weeks I am adding a whipple charger, what is the best vertical and prop shaft out there that will hold up to the hp I will be running? I hear different things from different people some people say to go with imco some are saying to go with the teauge marine. What are your thoughts.
Is there anything better than these?

I have reasonable shaft life with my Max Machine worx billet shafts, they last about 250 hours between shearing at 1000 ft lbs of tq blown, I tried running 5 blade maximus though and broke shaft immediately fwiw, I stay away from them now, Smitty