I could be mistaken but I recall that the York only has a single sheave pulley and if so would not work to run the alternator. You could get a used sanden style pretty cheaply I would guess.
Good luck,
Forest
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.