If you set all the way on the front, you may get by with a +8. It'll be scary when it tries to come up though. No offense about your motor, but I don't think many can get 120 hp out of a 4 mil Cub - especially not Trinity. However, they're 100 hp out of the box all day long [alky] (tuned or untuned, imo.) So if the porting has gained any hp over that, that's always a plus
I think you'll have a hard time trying to get the best of both worlds with that setup (hillshooting and duning).