Whoa. If they sweep correctly now, clocking them differently will send them into the cowl.
A couple questions:
1. Is the motor new? 2. After they are parked, can you push them and have the motor park them in the correct spot (i.e., is there a dead spot in the parking contactor)? 3. Are you sure you have the correct crank arm? '67 is different from '68-69