Edgar..,not sure about 74, but my 72 and 73 have identical carbs..
I did discover that (not sure years) these carbs "changed" when I was shopping for rebuild kits.. if displacement is the same, intake dia. (mm) also match.. I think your good.. unless physical fitment (frame/tank) gets in the way..
I've seen classic English Amal carbs on a 750, my Triu**h 650 had converted 2 stroke PKW/JRC carbs..
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