It all depends where it runs best at. That will also depend on the compression ratio, the kind of gas and the cam to name but a few. I have mine set at about 12 deg initial and 31 total using an MSD distributor with the quench heads. If you have the open chamber heads I imagine you could run at 12 initial and about 38 total on premium gas.
69 Sportsroof, 351C, 4spd toploader, Restomod BOSS 429 clone - the one and only (?) 1969 BOSS 351
http://home.swbell.net/boss351/mustang/boss1.jpg
http://stangnet.cardomain.com/user/adamg69
69 Sportsroof, 351C, 4spd toploader, Restomod BOSS 429 clone - the one and only (?) 1969 BOSS 351
http://home.swbell.net/boss351/mustang/boss1.jpg
http://stangnet.cardomain.com/user/adamg69