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Start by looking from underneath, as block age is main issue. Everything in photo interchanges on all the early blocks.
From underneath...look for a little separate lump near right front, made as part of pan but separate from actual sump. If it's there, block is '35 or '36.
If no little lump, block is '32-4, and you next need to look at water drains at lower front corners. If the hole in block is at 45 degrees to the world, '33-4. If it points straight down, '32.