Inspection of a 904 torqueflite

You said "hammer". I never hammer a bushing to start it in. I GENTLY tap it using a large flat plate. Many many gentle taps to get it started. That way you don't damage it; and you can tap it back out if it cocks slightly. If you HAMMER it to start it and it cocks; then it;s JUNK. Everything has bushings; cams, rods, distributors, transs, rearends, even carbs sometimes. You're not really a mechanic until you can do bushings.