68 cuda 340 engine color: international harvester red

I got mine at NAPA simply because that page I saw said so. Didn't think of going to a dealer but if that ones off too........ why bother. This stuff I got at NAPA seemed too "purply" I guess. definitely seemed a smidge too dark, but what would I know since probably all the other red small blocks I've seen were wrong too. I'll probably just go with the MP paint and call it good. I like that "thick" quality. When painting a new motor down to bare metal should we use a primer? And how many cans of top coat to do engine?