Thanks for the responses...
This is what I found in regards to the differences between the two years:
1983
M46,AW70
10.3:1 compression ratio
B23F LH-Jetronic
107hp@5400
127ft-lb@3500
1984
M46 only
9.5:1 compression ratio
B23F LH-Jetronic
111hp@5400
136ft-lb@2750
AW70 only
10.3:1 compression ratio
B23F LH-Jetronic
114hp@5400
133ft-lb@3500
I still don't have an answer to the question regarding the internals of the M46 equipped '84 B23F... I'm wondering how those differ from the '84 AW equipped and the '83 motors.
But the info shared here about the ignition definitely is helpful!
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