This may not directly answer your questions but give you some perespective. We (Atlanta Cobra Club) had an event in November in Commerce - the big drag track in the Atlanta area and all came away scratching our heads. Actually, our times were scewed based primarily on a verrrrry slippery non-treated track. Times ranged from 10.8 for purpose built slick tired Cobra to 15's. All 351W variants with the exception of a Winston Cup Car motor (673 hp) were in the 13's as were a couple of BB cars! With that said, highly modified Z06's were running mid 12's because we all had the same problems - traction in a big way. Sooooo if you want mid 12's (BTW I ran 12.5 @118 mph and yes I was dissapointed
) you better get have power & traction. Then again one other thing was definetly holding ME back - experience, practice, experience, practice! Have fun!