Schwee, this thread may help a bit:
https://firstgenfirebird.org/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=23;t=002055

But typically I start it out at about 9 degrees BTDC... But I'm still using a points Dist. So I set the Dwell at 30, initial timing about 9 BTDC and go from there...

I think Vikki's thread above may be closer to your combo, so read the first few entries?

I'm sure some one with better info will chime in soon!

Brett - 67 Drop Top 455!