Endura is a paint manufacturer based in Edmonton. They have over 40,000 colours. Very tough paint. We used it on our drilling rig projects. I used their products on my ‘51 GMC and ‘70 c10. I recommend looking them up.
https://www.endurapaint.com/Here’s my 70 with its LV Energy green from Endura. I sprayed the interior first. I masked the door jambs, roof lip, and rockers for this step. Let it dry. Then I masked the interior off and shot the exterior. It went really well. I used a little trailer and put a wheel on the screw jack. I put dollies under the tires, and was able to spin that cab 180° in the blast/paint booth. It worked like a charm if you have something like that available. Painting upside down was solved by using a siphon feed gun. Worked for me.