63 Dodge Dart, now let me see;)

Nothing much has been going on, however, I've been searching for an engine/trans~ I don't need a hotrod, just a good running engine would be nice. This ad on facebook came up, I've been reading on engines, but haven't learned very much. The La360 in the ad~ is there anything I can do with it while it's out of the car, I haven't bought it.
But what engine (v8) and trans~ what should I be looking for?

https://www.facebook.com/marketplace/item/749269163662612/?ref=messenger_share