First - welcome.
Now the bad news. The type of paint you want is no longer available for a couple of reasons, EPA regulations and new paint developments. The best you can do is to replicate color and texture of the types of paint the Ford used as well as the procedure.
The undercarriage was primed usually with a red primer although black and gray were used. All were flat textured. Small quantities of leftover body paint were added to the primer so the actual colors was inconsistant. This primer was painted over the entire undercarriage and front end from the doors forward with nothing installed. Then the doors and trunk lid were installed and the car was painted the final body color. The engine compartment was then painted semi-gloss black with the painter standing on the car's assembly rack. This limited what got painted. The transmission tunnel, for example, was painted only as was as the painter could reach and overspray was common. This also applied to the strut rod bracket as well, the top was black, the underside was primer. It was sloppy so don't be too concerned with accuracy.
Some red primer paints you can use:
R-M - A1787
Ditzler/PPG - 13075
Dupont - 4735
Krylon primer in a can is sometimes used.
As to the black: the biggest mistake is to use too glossy of a paint. Semi-gloss or satin paints vary in 'sheen' and flat is too flat.
Recomended is - PPG DAR9000 with DX685 flattener. You will need the DX685 specifications sheet to mix the flattener and catalyst according to eggshell which is about 30-35% gloss.
If that gets to be past your budget, try www.eastwood.com
but don't use their underhood black as it is too glossy.