What engine for my Wife's 70 dart

I really like 318's (and all small block mopars), but I wouldn't pay any more than 150 for a complete, running 318 2bbl. So many out there and if your the seller, there is very little interest.
I personally like the roller cam LA motors, saves the age old flat tappet needing zinc issue. As far as your wifey dealing with a carb'd car, you can limit the issues by having a perfect working carb (4bbl or 2bbl) and choke set up. Heads that have a fresh valve job aid in cold starts, and idling.