i seriously want to get into the 12's with my stock heads and cam. i have 3.73's right now, but they are just not going to cut it. if i go with 4.10's i'll cross the line ~5350 rpm with my 26x11.5" et streets. if i go with 4.30's i would cross the line ~5600 rpm with the same tires. since i need new tires anyway, i was thinking about getting a 27" tire and getting the 4.30's. i would then cross the line ~5450 rpm. what do you think?