From what I've seen ...
The 111 block was used in cars like the Electra and had:
- No distributor
- oil pump driven by splines
- 7/16" Dipstick
- VIN Code 3
- Roller cam
The 110 block was used in cars like the Century and had:
- VIN B
- No distributor
- 3/8" dipstrick
- 20 bolt oil pan
- flat tappet cam
I'm thinking the lifter bores might be different, due to the rollers