Need dial-back timing light

I've got a nearly 20 year old Craftsman and my son has a less than ten year old digital. Both read pretty similar. I'll know more when I get the car I'm working back together as I've had trouble with timing due to too much cam and two slightly bent exhaust valves. Yes, it's time to bring the manufacturing back here, but in the meantime...also, if you want really accurate info on the distributor curve you have to put the distributor on a machine...