Do you use a timing light ?

[elwood]

Hey guys, thank you all very much for the help.
I do know how to use a light, just never have used one on any of my flatheads..
I'm putting on of Jims units in a car for a customer, and wanted to use a light on it for a change..
So the correct timing " with a light " would be the dot on the pointer ? At what rpm ?
That's where I put the distributor in at, and they always start right up, and don't think Ive ever moved them from there much..
This car has had some over heating problems, and Ive heard timing off can cause this,