If it were mine, I would pull it apart for a top end rebuild on general principle. I would put lower compression pistons in it, and look around for a single carb manifold set up. They run soooooo much nicer with a bit lower compression, and a single carb.
That said, it should run ok as is. They are simple engines to work on, and parts are affordable. Your budds will be amazed when you tickle the carbs to get her to light.
They are fun bikes to ride, handle well. By the time the late T140 750's were being built, Triumph has them pretty well sorted.
Find out it's history, take a buddy and go see it, here it run. Make him an offer he can't refuse....