Timing question

I always hesitate when playing with the distributor on a running engine. I guess too many spark zaps. That is one way to find you need new plug wires. The small block is particularly tricky to get at. The Big Block has a much more exposed distributor. You can get new electronic adjustable timing lights cheap on Amazon (recall $30 for mine) or get an older fixed one for $2 at a garage sale. Get the clamp-on type, not the really old ones that wire in-line with the plug wire.