For 62, the timing is 5 degrees before tdc on a stock motor at idle (475-500 rpm). The mechanical advance comes in as follows: 0-2 degrees at 375 distributor rpm (double this figure for engine rpm), 5-7 at 750 distributor rpm, 10-12 at 1450, and 13-15 at 1875. For a total of 32-36 degrees advance, depending on the fuel and what the motor likes, might be more or less.
