Is there anything special to look out for when inspecting a 1970 Dart Swinger?

"clean title" doesn't mean ****

you want the plate and the last 5 of the VIN to run thru the DMV reg fee calculator online. that will tell you if any back fees are owed on the car and what it will cost to transfer and reg in your name.

if the seller's name isn't on the title, no go.
if the title has been signed by somebody else, no go
if it's been signed over and not dated from somebody else, no go

if it's not in system you need the title and the last known reg-- and they better match-- to get headed in the right direction.

if there's none of that, then you're gonna be jumping thru hoops.

vehicles no longer go off book in california after a few years. it used to be 7, it's now 10. and if any inquiry is made that flags the vin or the plate off in that time span-- even if hasn't been reg'd, the clock starts over.

if the seller won't give you the plate and the vin to run it: walk away.

all that being said, i think the price is high for what is represented in the photos. it looks a little slap dash and thrown together to flip. if you're going to spend that kinda dosh, there's much better examples out there.