Keeping with TJ's suggestion, that's how far I advanced the timing, around 5 degrees. It ran a lot smoother.Once you put in new plugs and install the dizzy correctly, set timing.
I have heard 1 degree of advance for each 1000' above sea level is a good place to start.
you can listen and set timing by ear to where she sounds happy. Or, if you have a vacuum gauge, you can set timing for max vacuum at idle.
Make sure your idle is set to factory (700 RPM?).
You may have to dial back on the timing from that max vacuum to prevent detonation under load - run it hard up a hill and listen for pinging.