I burnt up several Sears chrome timing lights years ago with the early MSD race boxes like the 404B and 404C and maybe even one of those lights with a early MSD 7 and a MSD 7C box before they switch to the newer 7AL2 boxes.
I ended up buying two of the Penske brand Sears timing lights and they have not fail yet , so far luck
I also bought a Flaming river stand alone D cell battery powered light and it works okay as long as I can shade the balancer and timing tab so I can see the numbers on the balancer blush Fender cover works well over the top of the motor to make shade , usually scope

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)