right now i have original 10-bolt with a 3.08 auburn minispool. Id like to turn my car into 500 maybe 600 hp car one day.... i plan to run it at the strip every once in awhile but for the most part keep it for pleasure and shows... i have 26.6 in wheels on the rear. My first question is should i upgrade to a 12 bolt. (Guessing yes)... and then second what ratio? Ive been told 3.73 but would lower such as 3.42 or 3.55 suit my needs? Current has a th350 in it... but i plan to put in a 4 speed. I know there is a formula to figure out everything but would liek the opinions of you seasoned vets! Thanks in advance!