Distributor keeps adding advanced without stop?

Lite set on 2-cycle? or is it a 2-cycle lite ?
It is highly unlikely to be 60 plus mechanical... because the spark will be desperate to be jumping to the next tower.

On another note;
Most street engines will want a total cruise timing (and also whenever lightly loaded) of 52 or more degrees at somewhere between 2200 and 2600, occasionally even 56*, at slightly higher Rs. During testing, for instance,my 367 has not complained about 60*@ 2250@ 62mph. In most cases the factory D will not provide this.