My pickup has a crate motor from Jasper Engines, and a Carter YF carb, so whatever was original has long since departed. The previous owner had installed an overdrive relay, but no kickdown capability at all. It was a pain to drive that way.

If you would send me a photo or part # of the relay you have, I will try to conjure up a wiring diagram for you.

-Kevin

This is what happens when you live with a house-full of women, the wife and daughters name all the cars:
1960 Impala - "Frankie" (Frank Sinatra)
1961 Apache - " 'Mater Jr." (wrecker)
1965 Corvair Monza Convertible
1967 C20 "Ol' Blue" (hidden in a log cabin for 30 years)
1972 SuperBeetle Convertible - "Juliet"
1976 SuperBeetle Convertible - "Olaf"
1988 Alfa Romeo Spider Veloce - "Romeo"