What will it run with new convertor? Guess

I thought it odd that your best et at the worst 60 foot time. My personal experience has been that the better my 60 foot time the better my et ?
Story behind that one...last two slips were between me and a corvette.
First time I ran him I beat him I ran a 14.44 and he a 14.30...
Last run of the night for me we were sitting in the water box waiting for the cars to clear the track when he starts smoking his tires,the guys flipped out and stopped him.They signal me to go ahead and I heated them up and just when I was going to stage he lites them up again past the tree as they were backing up one guys knocks on my door and tells me he has been hearing me missing out on the top end and says just shift sooner and you will smoke this vette.Well light turns green after my tires are now cold and they spin a little before it hooks up.I lost dash lights and could not see my tach but I did shift sooner on both 1-2 and then 2-3.
Vette passed me at the very end.
That guy probably in a 13 second car...LOL