[Tommy]

brainsboy -
Your question leaves a lot of room for an answer. I assume you are speaking of initial timing at idle. The answer depends on the total mechanical advance programmed into your distributor and whether or not you have vacuum advance. It also depends on your compression ratio, fuel octane, the prevailing air temperature and some other things. ... Many folks without a vacuum advance set the intial timing such that it plus the mechanical advance equals the total they seek. On my 410 Windsor with 9.8 C.R., I set the total advance when using 93 octane gas at about 32 degrees.