I think you should do it. It's alot of money but it's nice having a tranny you don't have to worry about. The tremec 3550 would be cheaper and no driveshaft yolk or special clutch. The only difference in the two are the input/output shaft is beefed up in the TKO.
However since you are in the 11's and will probably want to go faster I would get the TKO.
My buddy broke 3 t-5's so when I went stick I went straight to 3550. So far so good.
Bite the bullet, survive at the track and sleep at night. Good luck.
------------------
82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A
Kevin's Capri
Kevin's Mustang