Timing for electronic ignition upgrade

All good input, guys. Thanks.
Bewy, as I mentioned I have no idea what is inside the engine so I don't know what the cam specs would be. Once its warmed up, it idles a little "loapey" at 650 RPM but nothing drastic. I'll try advancing the initial timing until it starts to detonate, then back off a degree or two, and see if it makes a difference. If it doesn't, I'll have a local speed shop check out the distributor on their machine. Thanks again.