63 DART V8 WIRING

The biggest issue with your swap is that the firewall/wiper mounting area in the engine bay was not designed to clear a V8, and will require a bit of reworking/mods to the wiper motor mounts for the 360 to fit. There's a few threads on this- do a search and you'll find out the particulars on this and a few other issues like the throttle cable and centerlink...
Here's one to get you started:
'63 DART V8 | For A Bodies Only Mopar Forum