baby steps forward & a step back - 2K urethane Epoxy primer.

You got rid of the rust, yes hand sanding out runs of epoxy ain't easy, but you will have paint of a slid car when you are done! I have used $30 HVP guns from Summit that work plenty good. Add the little plastic moisture trap ( $3-4) at the gun the be safe from water in air if the one at the compressor is MIA!
F bodies are COOL and inexpensive project. I love mine.