Brent Mills Brent 3 ways Drill the holes out to the next size for all the bolt holes, then center your bell housing and weld 2 nuts to the housing where the pins go, make sure to test twice and weld once. If you want out the pins, drill and tap them with 1/4". Put the bolt on a slide hammer and pop them out. Unless the motor is out of the car, drilling the bellhousing is the best. The rub goldberg way is to weld a piece of flat stock to the pins and twist them out. With ANY WELDING UNHOOK THE POWER TO THE CAR TO PERVENT DAMAGE TO THE ELECTRICAL SYSTEM.
Good luck Brent
Rick Lake