Dragin
Your three prefix codes are typical of what I see,when I see a 390HP in a Station wagon.
You have a 2:73 Posi rearend,and a TH400 trans. that was shared with the Chevelle/Monte Carlo as well.
I can't seem to locate the pix I've taken of these in the past,so here is some Dealer/Customer literature I have when ordering them.
This is the back of the Dealers Brochure for 1970 Station Wagons.
