Saab Two Stroke Block & Crankshaft ID & firmament.

Saab three cylinder, two stroke engine block, and Crankshaft identification and proper mating. 1956 through 1968. This video covers the different block designs that will accept a different style Crankshaft.
The main thing to keep in mind is the latest injected Crankshafts have 4 oil slingers that supply a dual oil feed to the center Rod. And they will ONLY fit in the later blocks. The 732515 Monte Carlo and 732045 Lubrication deluxe. 
The earlier injected blocks have only 3 oil slingers & a single feed to the center Rod. Those will fit ANY oil injected block.