Manifold plate says westerbeke
But looking at brochures it looks like a w40.
, injection pump are on port side. Raw waterpump is on port side and not belt driven.
Injectors are on port side between manifold and block.
Starter is on starboard side but its protruding along the block forward. (indicating a pre-1979 model w40).
is aft on top of the flywheel housing.
I was able to get some numbers off the block.
Port side: B22 M6
and then further away near port aft mounting holes: BNW
Starboard side forward of the starter: MC25550 or O
Starboard side behind starter: PN371 1 2990 (not sure if the last 0 might be O)