Caps, that sounds like a 76' TT500C.
I understand they are getting harder to find (plenty of XT's) but I'd not like to put a price on it.
Like Paul said, check the frame/engine No. If they match that's good. If it starts with 583 it's a TT, if it's 1E6 it's an XT.
I recently paid $1000 for a tidy G model XT (80) and a C (76) in a box.
Brent