yeah, it all interchanges. you'll need to remark your balancer for TDC. unless it already has one (some balancers do, or it could be an early or late one-- anything can change in 50 years).
remember though, the pulleys are specific to the early and late style, so you may have alignment issues if you have p/s or a/c but the alt. is usually pretty close and can be sorted with a little futzing about.
what side is the radiator outlet on? that may color your decision...
