See if this helps.
Damaged but original 67 Headlight connector.
View attachment 1715477399
Here's one of my cheat sheets
View attachment 1715477404
So it looks to me like
B1 gets power from main splice. 16 awg Black with white tracer. (L1 on the 68 diagram)
P is not used
B2 gets power from a fuse thats always hot. 18 awg Pink (L8 on 68). Same terminal is used as junction for power to dome light(s) (
Junction relocated in 68)
D is Dome light return (ground side). Terminal with two Yellow 18 ga wires is junction in the wire between the door jamb switches. Close any switch to ground and the circuit is complete. (M2 & M2A in '68, prob the same function)
Instr is power out to the instrument illumination fuse. 18 awg Tan (E1 in 68)
R is power to parking lights. 16 awg Yellow with black? tracer to front, 18 ga black? to rear. (L7 & L17 in 68, Color changed)
H is power to Headlight Hi/low switch. Green (L2 in '68)
So the dome light wiring junctions are different in '68, the front parking light wire color changes, and the body wiring connector changes from 6 to 8 cavities. Bulkhead connector as you prob know is rearrenged in '68.