are you running a stock type ignition system?
Do you know what you initial timing is set at? S/be ~ 10 degrees BTDC as a starting point wit the vacuum advance disconnected if you have it hooked up..
Are you running a vacuum advance?
If so, is it hooked up to manifold or ported vacuum. Should be ported. but some may argue that.
Also need to know what your mechanical advance is doing ad make sure it is not affecting your initial timing setting.

Any other oddities such as idle, setting mixture, surging issues ?