Hi,Jnkgal! I would go with 30"-31" tire again,and keep the 4:56 gear...if you're revving 10% over your peak power rpm in the 1/4 mile! BTW...NICE SELF PORTRAIT! Looks like you're making a wise choice in professions,also! My wife's been an RN for 20 yrs...VERY GOOD job security! Good Luck with your schooling! Remember this fine work of art you did for me a while back??? Really appreciate it!