Dahla, Just to confuse the issue I'm running SS Long Cannons with a K&N, no extra holes in the airbox and a home made bellmouth . I'm set up with 42 pilots and 125 mains but I'm using Thruxton needles with two shims and I'm about 1000 ft above sea level(at least when I leave my house). If you're going to drill your box you should be close to perfect with the jets you have.

A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)