Duplicolor makes a semi-gloss black engine paint that they advertise as Ford Black. It's a great product and I've gone through dozens of cans, as I use it everywhere.
My two cents is to modify your ride as you want it. No one is volunteering to pay me to run a museum, and I want to drive my car with comfort and convenience, so I have dozens of modifications.
Some things I've kept as original as possible, like the exterior body lines and chrome, because I like the character of it. I have the original color but with clear coat because I like the gloss and protection that it affords.
My interior is rebuilt mostly original but I have several modifications there as well. Leather seats, retractable shoulder belts, modern stereo (with retro looks), and I covered the dash with matching vinyl with French stitching- a far superior look to a plastic dash cover.