Stop in for a cup of coffee
Got the alternator back together with a new bearing and rectifier. Tested out a couple others.
Then took the heater box down. Well it was definately leaking. And no the replacement won't fit - which I had a sneaking suspicion about all along.
Maybe it can be bent to fit. But there's probably a reason the other one is routed like this instead of direct.
I'll see if the radiator guy in Pottstown can recore the old one.