Thats a rough estimate on my part. The one I would use is local to me. Same guy that painted my former 1970 Challenger 340 about 8 years ago.
I brought him a partially dis-assembled but drivable car .
He stripped it to bare metal, repaired the small amount of rust in the rear window channel and repainted the car in base clear for $3200. I did all the reassembly work .
That is just outer body. No door jams, , trunk or engine compartment paint.
I am currently doing a ground up on a 1968 Charger R/T .Once it get it to the point it's ready for panel fitting , blocking and paint, He'll be the one to take over. So I'll know then a better estimate ( probably next spring sometime)

my old challenger .
I removed the original top , bumpers, ft+rear glass and all the trim. I had another shop re-install the ft+rear glass and vinyl top