What kind of paint did the factory use in the 60's?

So I'm getting ready to paint my engine bay and was wondering if you can still buy factory style paint from the 60's. I know there were a lot of changes in the laws but do they still sell that kind of hard, one step paint they used to use? Or what is the modern substitute? I was going to buy a new Wagner control spray plus electric HLVP gun for a bunch of projects and figured it might work better then spray cans for under the hood. I have all the codes for my 68 WW1 Barracuda so will just buy a pint from the paint store. Is that enough for the engine bay and the underside of the hood? This isn't trying to be a restoration or a show car, just a clean slate for my driver.