Just got an a833od from 1977 for a 65 barracuda

Outsider said
Don't need to run any numbers, the case is a '70 and up. The last year for the big block Dart was '69.

whats the difference between the '70 and up cases and the '69 and earlier ones?

also what would the 4.8in ibr come out of? a 340 car? I thought the large ibr was only in big block cars

Sorry night rider on the thread hijack