Joe,
I thought I read your bike specs somewhere the other night. A GL1200 Block, GL1100 Heads, in a GL1000 Frame, is that right? I see online some Gates belts as
T274 for all GL1000 & 1100s, but also a T184? And then a T070 for the GL1200. What belts did you use with the block & heads combo you have? I have 2 '75 GL1000 Parts Bikes, and one '77 GL1000 parts bike, all with heads, but I don't think they match what you have, or do they? I still have a spare pair of low-mileage T274 belts. I know Hondas were really good about cross-year compatibility, but heads and belts? You would know better than I, so let me know if I can help!
-Graves-