I run 10psi in my 29 x 10 hoosiers. Far as the carb goes check float level, fuel pressure (about 7-8 psi), be sure it has a slosh tube front and rear, I've seen some builders leave rear out and it causes problems when your on the brakes after a burnout. Definately more gear will help a bunch, 430 or 456 and still allow you to run 1/4 tracks. When you open the headers you may find it necessary to go up on the jets a bit. Also when you stall the converter don't try to stall it 3000 at the tree. maybe just 1500 or 2000 anf allow it to flash the additional 1500 or 1000. Once you learn to stage this way, you'll have beter reaction and 60 ft. times. Doing this allows the suspension to work instead of being in a preloaded state.