Steve, Congrats on your new car!!! You scored!
My only reservation is how well the rattle can spray applies. I've used a number of spray guns from Devilbis to cheap Harbor Freight spray guns that I think would apply it better than a spray can. On that large a surface I just think you will get better coverage and blend using a spray gun. And with the amount of prep that went into your engine bay IMO it deserves a decent spray gun finish. Post pictures when you finish!