Well, honestly. Not where I grew up. The big finned era was short, and even at the time not everyone was a fan. Also I think a big part of it had to do with how long most people held onto cars back then. Something like 6 to 7 years was average age of cars on the road. 100,000 miles on an engine without a rebuild was super rare then.
I don't remember many cars from 1970 - I was pretty small. Dad's early 50's Chevy died. He took Mom's Rambler American and Mom bought a new 69 Belvidere. New! Grandma had a mid60s Chevy Bel air.