slant questions

so here's the scenario...i'm getting set to close a deal on a 63 dart 4-door /6-automatic that will be my wife's cruiser/driver. the car is VERY solid but the motor is removed as it was froze up due to water getting into it. I still have the slant that came out of my 64 that has only about 52k on it but hasn't ran in at least 12-15 years. plus the top end is disassembled from it. however, it has been in dry storage for quite a while.
i'm new to the slant 6 so I am looking for suggestions on where to get a good quality and relatively cheap rebuild kit for a 64 slant, and also things to watch out for when i'm rebuilding it. not really interested in hopping it up, as extreme reliability is the main concern. don't want my wife and son getting stranded, have to keep them cruising in style!
thanks in advance for any suggestions.
-Tim