+1 on the Krylon Industrial 1613, especially for the Engine Compartment. For the Interior, however, I have a different preference. Back in the early 80's, I was re-doing (not restoring at that time, just "re-doing") my '66, I still wanted the "correct" Interior Paint. To my surprise, I found that the Black Interior Paint was still available from Ford in 15 oz spray cans. I bought 10 or so. This Black was used in the 50's, 60's, 70's and probably longer. But realizing that this paint may not store well over time (as Bob mentioned, lose pressure), or dry up), I decided to see if I could find a spray paint that might have a chance of being available "down the road". I tried quite a few different brands, and interestingly, came up with Krylon Satin. Ironically, this has a similar code as the semi-flat 1613 (actually K01613), and is 51613. It is, at least to my eyes, just about as close as one can get to the Ford M4J 1724 Black Interior Paint. The Krylon Satin Black has changed names over the years (Indoor/Outdoor, ColorMaster, etc.), but the color appears the same. I have purchased and use some of this as recently as within the last 6 months, and at $4.49 per can, it's hard to go wrong. I will use it on my '66 when I restore it, if my Ford Paint hasn't made it through the years.
Bob