If your not just interested in going faster I would do what inline 4 suggests and leave it alone. If you do feel the need for speed than bigger carbs at that altitude would help. You could bore yours or buy a set of 38's mm Pat Hauck would be a good guy to help you. I would suggest throw on the pipes, and see what you gain by that, just take small steps because any drag racer knows when you make changes you have to start all over again with y
our setup. Let us know how everything goes. I think your best to go with a 10.5 track but you will need to do some work to your suspension or buy aftermarket, I've heard that you can gain 1/2 second by doing this and it won't screw up the setup that you have. And it sounds like you've got it dialed in perfect.