In my opinion the only way to anyone is going to gain from these mods is to let the engine rev higher than stock, this will require a smaller prop, ei less pitch, less diameter or both. Additional torque is hard to come by, in fact with many mods you lose torque and narrow the rpm it is spread over, as in peakier, to gain a few rpm. I've worked on my brothers stock car engines and read enough dyno charts to know, there ain't no free lunch. If you want to gain a little here you have to give a little there.