I hate to keep using this term but, "IN THE INTEREST OF ACCURACY" GM DID put Buick V6s in, for instance, my gutless, head gasket blowing, un-even firing, no mileage CHEVROLET '82 El Camino. A genuine piece of Doo-Doo! Loved it!
Apparantly the corporation was desperate in those days whether it be smog related or greed. It may be worth an investigation since the S-10 was, I recall, produced then (or were they still (Izusus) LUVS? They too could have been cursed with a Buick motor- or, come to think, were their engines all the equally pathetically gutless 60 degree V6?