Most likely you are one notch advanced, but don't take any chances with this. CAREFULLY put the crankshaft at ZERO degrees, put the cam at the mark and put on the chain. With the chain in place, turn the engine two full turns until the crankshaft is exactly at zero and check the cam. The cam marks should align. If not you may have a "stretched" chain.

DO NOT CRANK THIS ENGINE WITH THE STARTER UNTIL YOU ARE SURE THAT EVERYTHING IS RIGHT AND THERE IS NO PISTON/VALVE CONTACT!!!!!!!!

Best of luck,