You are behind the times. You don't need to drill the crank for a pilot bushing. Buy the one that fits in the torque converter register. Most of the crankshafts have deep enough holes drilled into the end of the cranks that the part of the pilot shaft that sticks through the bearing just sits inside its little cavity. It did on my '86 Fifth Ave. motor with room to spare.
Or you can trim the pilot a little if it bottoms out. No big deal.

R.