The number on the front tab is CE157190
I believe the CE is a replacement engine, I am sure what the six numbers that follow mean.

Rear Number: 3969854
I came up with this:
3969854....396.......69......2 or 4 bolt
3969854....402.......70-72...2 or 4 bolt

Near starter: TO90

It is a two bolt by the way.

Any additional information would be appreciated.


thanks, Dan

fyi

http://www.synthetic-oil.com/images/ce.jpg