...BTW your Bieber avatar is awesome.-Malone
so if gassers don't have a mark on the flywheel for TDC, how do make sure the timing belt is installed correctly when you replace it?
TDC is irrelevant. You use the BTDC mark on the flywheel, the notch in the cam gear and then align the distributor so the rotor is facing the proper way. You are basically timing the motor BTDC, instead of at TDC