Jadaharabi said

Where do you get "an undersized bushing"?

I just measured my 92 LA roller motor crankshaft depth. 2 3/4 inches deep.
I don't really think if you drill the back of the crank you're going to hit an oil passage. There is no oil passage that goes thru the center of the crank main journal. The number 8 rod journal is fed at an angle from the main. Chrysler drilled cranks for years for the pilot bushings.
Isn't there a roller bearing that takes the place of the bronze bushing and makes shifting easier?

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​	Product ID: PB329 PB329 PILOT BUSHING, STANDARD	Details​
Standard replacement pilot bushing, for original 4-speed crankshafts, .940" outside diameter, .754" inside diameter and .875" long. Should measure approximately .750" inside diameter when installed. Will NOT fit original automatic crankshafts, see our PB5300.
Price: $4.95​	​
​	Product ID: PB5300 PB5300 PILOT ROLLER BEARING/ADAPTER	Details​
Roller bearing assembly, fits in the larger 1.815" diameter hole (torque converter register) in crankshaft, ideal for 4-speed transmissions that have had input cut off, or in any crankshaft that won't accept standard bushing. Installs with numbers facing out.
Price: $19.95​