Sorry, I misread your post; saw "de-smogged" instead of smogged.
On a stock smogged truck, the starting point for advance depends on your elevation. 7 degrees is for near sea level. Higher elevations require more advance.
A de-smogged 2F usually likes more advance, not less. 10 degrees BTDC would be a starting point for me - but I advance mine as far as it will go without knocking or pinging under load; that is the sweet spot for the most power and the lowest engine temperature. Retarded timing will make it...