Narrow,
You might try this site.
www.triplesonline.com
The basics, of course. Freash gas, oil, clean the sludge trap under the motor. If it still has points, it'll be a tough road. I chucked the points ASAP for a Boyer. Triples are finicky with the valves. Hard starting if you don't have it right. The Amals will need some attention. Get a manual!! You'll need it. Go to the above site, ask questions, search the archives. We all have Meriden triples, and we're all only too happy to help a newby get another one on the road!
Cheers,
Troy