question about a king cobra clutch in a cobra motor

My deductive logic would tell me that if you have a COBRA motor, then a King COBRA clutch would, in theory, be originally intended for ... well, a COBRA. :D

But yeah, a T-5 is pretty much a T-5. Bolt 'er up and love 'er! I have no regrets about mine, whatsoever ... aside from the usual woes of driving a stick in heavy traffic. ;)
 
The cobra clutch is the clutch that came with cobras. The KC is just a hair better but the Cobra clutches are great.

It seems to me that you'd want a Cobra spec T5 to be genre-correct. As said, any of the later Aero fox T5's should work alright. DO BE sure to upgrade the input shaft bearing retainer to steel if using a GT box.
Good luck.