Do some homework on those T-Tops. I was looking at some old pic's of my 79 and the tops go all the way back, even with the vertical angle of the side windows.
Here's an old grainy pic of my Z so you know what I'm talking about.
Only reason I mention it is they leaked like a sieve and if the rubber is old, you'll have issues with it. If this will live in the garage and you'll only drive it on sunny days, you'll the T-tops.