Ok here are a few of some personal transmissions that I have. 2 are from 68 cars. Both are stamped PK with the part number and dates that look to be the correct 10,000 day calendar. One being a 68 hemi 727 that has a partial vin stamp, and the other a 68 904 unit.
A couple others are from 1967 year cars both stamped with H and part number. One of those is for a 67 hemi auto H2801544. I bought the trans from a guy who said he pulled the engine and trans from a running car 35-40 years ago, and he only sold the engine and stuff a coupe years ago.
the other is a 67 440 HP trans a H2801541. The trans with the H plant stamping has the strange dates that would not be correct for the normal thinking of the 10,000 day calendar, but it is the same as the 66 hemi trans pictures that I posted earlier. Maybe we can figure this out.
Matt