I once drove a used B body of that era with a 301 from our dealership. We took it to Nebraska. Killer fuel mileage but barely could get out of it's own way!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)