My timing is about 18 initial and 30 total, no vacuum advance. Keep an eye on plugs for black specs = detonation or insulator showing a yellowish color = cyl temps excessive and rising extreamly fast.
I'm at about 23/33 . For a stroker it doesn't seem to like lower rpm's. But I'm thinking that's mostly the cam talking. I've still got so much tuning left on the table .