The upper A-frame bushings are different between 140/164 but you might be
able to change upper A-frames WITH bushings and shaft.
The early 140 used the same lower bushings as the 122 but later ones are the
same as the 164. The clutch is a different size, no matter how many bolts.
(Mostly when you change from 6 to 8 bolts what is different is the flywheel -
the rest of the stuff on the 140 is fairly interchangeable as long as the
parts match each other, i.e. the coil spring clutch uses a different throwout
bearing from the diaphragm clutch.)
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George Downs Bartlesville, Heart of the USA!