As for 1970 models, I've never heard of, or seen in literature, a t 37 with more than a 350. I've never even seen one with a 4bbl but, they were probably avail with one. This was an entry level economy car, not a performance car. I have a '71 t 37 coupe in my yard. Your car is on my trailer I'll be headed east soon!
Steve Barcak
www.pontiacheaven.org