Stop in for a cup of coffee

Mornin' folks!

Staring at the wall in the guest house here on the coast. Wondering how to get a support structure for the drywall up - flat and level.

Chris, I've missed a lot, what Dart?
my real dad is selling a 73 dart. solid car, older restoration. its a solid roller. 318 car, comes with a 90 318 running to put in.