pilot bushing

I am installing a 318 from an automatic transmission into my 4-speed 65 barracuda. I know I need a pilot bushing in the motor and bought one. The problem is that it woun't go into the crank. The bushing from the old motor slides in and out of the new motor with no resistance. The new bushing will not fit into either of the motors. It looks like I would need to drive it into the hole with a hammer. Sohuld the bushing be driven in like that or should I use the old bushing that easily fits into the new motor.
Dan