Another 76 Brazilian Hardtop

The painter did outstanding job on the paint.
You engine problem looks to me was a combination of problems.

The milkshake color in the oil pan is antifreeze or water, you either blew a head gasket, intake gasket or have a cracked head, block or intake manifold.

The scratches in the cylinders indicate to me that the cylinder walls accumulated moisture when it was out of the car, which is noticably by the rust on the top of the cylinders. This caused the rings to scratch the cylinder walls.

Just an observation, how did the motor run before you took it out of the car?