I could use a 1974 slant six manifold heat control valve expert!

cruiser said

Notice how the bent end of the spring rests against the left side of the peg in the FSM photo. On my car, the bent end of the spring is to the right of the peg.

View attachment 1715995366

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In the 1970 FSM, the bent end of the spring is on the right side of the pin. Like on your car, Cruiser.
But it's a 1970 configuration, not 1973 (and the viewing direction isn't specified).

ASAP, I will check on my '71 198ci the mounting direction of the spring

François