A hardwood wedge driven between the clutch cover and the bellhousing can serve as a "helper" also. Just do something to keep the hammer blows off the front of the thrust bearing. Use the water pump housing as a drill guide to spot-face a couple of dimples in the front of the block to be sure the holes get drilled in the right place.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!