how much initial timing mild 360 magnum

Hmmm:

"To really make a trick street set-up you should only have about 10 degrees or so of mechanical advance in the distributor and about 24 - 26 degrees of initial timing on the crank to obtain your total of 34 - 36 degrees of total timing. This will launch you out of the hole much harder, and give you great jack rabbit starts from street light to street light."

Maybe with a stock 318. My car will burn the tires down to the lug nuts if I try to leave hard with even a base level of initial timing. Savvy street racers use a timed retard to pull timing out for one or two seconds so they can get off the line without annihilating the tires...

On the track my car never sees less than 2500 RPM and all my timing is in by then anyway.