I know its been a while but... I got to go home this Christmas and took my grand prix to the track down there. Cause it doesn't snow there and the track is open year round! Here is how I did.
60ft 1.975
1/8 8.852
1/4 13.821
This is actually my new best... it beat my previous best by .001 sec. lol The only change was a muffler delete. And it sounds awesome if you are wondering.