Timing lights

Yes, but "from a previous life" I simply don't trust them generally. Once again garage sales, Craigslist comes to play. I've actually got about 3 lights, which I haven't paid over 10 bucks each for.

The thing is, you can buy the proper sized timing tape, or just measure around the damper carefully, "figure" how many degrees per inch that works out, and then just mark the dampener

This is easily done with a small square and a sharp awl, or a hard sheet rock/ sheet metal screw pressed into service. Scribe marks over and over until you get them deep, and then if you want, mark the 10 degree points deeper, carfully, with a triangular file.

I did my old 340 to 2* but I've only done the 318 to "every five" and find that plenty accurate enough. You can estimate in between the fives which gives you every 2 1/2