Timing is 15 degrees BTDC.

As long as all the marks are lined up, you should be good to go.

To time the bottom, the little key on the crank end should be pointing UP. Now look on the lower right and you will see a little dot on the sproket on the crank. It should be lined up to another little dot on the block down there.

On the cams, find the little dots and the marks to time it are on the cover behind them. One at 10 o'clock (intake) and exhaust at 2 o'clock.