Can anyone help decode Mopar distributor numbers?

Fishing68 said
Interesting, I will wait to hear back from Halifaxhops.

In the meantime I had had someone outside FABO chime in on the published application for the Mopar Electronic distributor with the part number 3656763 and they say the Mopar book lists it as for a 340...

Does anyone know if in 1972-73 the 340 engines were paired with 4bbl or 2bbl or both?
Click to expand...
As TMM posted, the 763 came on a 318 2bbl in '73 and '74. A '72 340 came with a 3656278 and a '73 340 came with a 3656771. All 340's those years were thermoquad 4bbl's. The first year for an LA 318 4bbl is 1978. The differences between most of those electronic distributors are the mechanical advance curve, and the throw on the vacuum advance.