As to the crank, drilling and tapping would be my choice, like others have stated. The early cranks, pre-70, if memory serves right, did not have the tapped snout, and the procedure laid out in the factory manuals was to simply drive the balancer/dampener onto the crank nose using a lead mallet. Since not everyone has access to a lead mallet, a block of wood and a big hammer were most often substituted, and a bazillion of them were done this way with no appreciable harm. I will say that I am no fan of banging on the front end (or rear end, for that matter) of any crankshaft, and that must be a valid concern, because Chevy did finally add threads and a retaining bolt to the things, and life for an engine builder of Chevys has been so much nicer, since, with the use of a balancer/dampener remover, and an installer.