Thanks JW51,
I used the dark grey engine enamel from
The Filling Station. It took a couple of cans to paint the engine and bellhousing. I purchased three cans for the job as recommended by 52Carl and I'm glad I did. The third can has been useful for some touch-up.
Originally, I had planned to use Ford Dark Gray Engine Enamel, a Rustoleum product. However, I bought a can locally assuming the hardware store would get more inventory and learned shortly thereafter it was discontinued by Rustoleum........