My brother has a zz3 in his nova. They came with HEI's, so I'm not sure about what you should set the dwell at. I do know that the initial timing should be set at 10 degrees BTDC. I would try the gm performance parts website, they should have copies of the manuals. If no luck there, you should be able to use the zz4 manual. I'm not sure, but I think they changed the intake to get another 10hp.
1969 Camaro 350, Trickflow heads, ST-10 4spd, Hotchkis suspension, Baer SS brake kit, moser 12bolt