I have heard a lot of people bragging on Akzonobel Lesonal paint. My 68 Roadrunner is QQ1, which looks like, but is different than B5 Blue. I stole this pic from Darren (Burdar) to be able to remember the name. The guy at our paint store here that sells that brand says they can make all of the old colors, so maybe do a spray out of that before you decide. do the engine compartment in single stage urethane. Even good clear will yellow from the underhood heat after a while. For clear, I like the Universal clear from Southern Polyurethane Inc. I am by no means a professional painter, but I know enough to do my own cars. Couldn't afford it if I didn't....lol. I have learned a lot from watching "Gunman" and "Paint Society" You Tube videos and then going to the garage and seeing what works well for me. Good luck with it. I know you will do a great job.
https://www.southernpolyurethanes.com/