Ok. 16 means 16degrees BTDC on idle, and 39btdc at full rpm. the .510 means .510 lift on the camshaft. remember, when timing, remove the vacuum advance if installed. Possibly the best way to time a motor is with a vacuum guage. Install it on a manifold vacum port, and turn the distributor untill you reach peak vacuum. This should put you in good range. Drive it, and fine tune as needed.