These might not be the final versions, but I thought I'd post what I have so far.
I will post a note if I change this info.
"Plate" refers to the racking plate the carbs are attached to.
Diaphragm carbs did not use a plate, they used steel-angle brackets.
Old-style motor:
1974 (D1) (Standard) : piston CV with plate, using 16065-037
1975 D(2) (Standard) : piston CV with plate, using 16065-037
1975 S(1) (Special) : piston CV with plate, using 16065-037
1976 D3 (Standard) : piston CV with plate, using 16065-037
1976 S2 (Special) : piston CV with plate, using 16065-037
1977 A1 (Deluxe) : piston CV with plate, using 16065-037
1977 D4 (Standard) : diaphragm CV no plate, using 16065-048
1977 S3 (Special) : diaphragm CV no plate, using 16065-048
1978 A2 (Deluxe) : diaphragm CV no plate, using 16065-048
New-style motor:
1978 B1 (Standard) : diaphragm CV no plate, using 16065-1002
1978 C1 (Special) : diaphragm CV no plate, using 16065-1002
1979 B2 (Standard) : diaphragm CV no plate, using 16065-1002
1979 H1 (Ltd) : diaphragm CV no plate, using 16065-1002
This port diagram and holder diagram applies to the older-style motor only.
If someone wants to confirm the bolt angle through actual measurement, that would be great. Calculations can be off more than actual measurements.