If you already hold the B you can run for the A on a license run..no worries just remember to take your timing ticket to the starter and have him sign it, then return to impond with it and ask for Dan Warner...he or someone will then log it and issue your A.
FYI
If you qualify for the record on your A attempt return first to impound and do not return to the pits until you have brought the vehicle and timing ticket to the person/inspector in impound...again..do NOT drive/tow your vehicle through the pits without going DIRECTLY to impond or it will void your attempt.
Good luck.
J