Need timing help

Yes, the marks to align with are on the lower part of the tab since the crank turns cw (viewed from the front). Many people increase the timing to ~20 deg BTDC. That can give better gas mileage and performance. With your improved ignition, you might be able to run a leaner idle mixture and increased timing. To measure greater than the 10 deg mark on the tab, you need an adjustable timing light. I got a digital one recently for ~$25, either ebay or Amazon (forgot). If you have an MSD ignition, that messes up some timing lights.