To convert to discs or not convert? That is the question!

I second the Scarebird conversion suggestion. Probably the cheapest unless you score another disk setup cheap, and I'd say definitely the easiest to convert to since you don't even have to change the spindles. I did the same thing on my '72, even spent a while looking for what seemed like the last set of front drums sitting in a dusty warehouse in Kansas, and I regret not just upgrading to disks right away.