Smoke from breathers.

What you need is a breather with a nipple on it that has a hose that runs to the air cleaner, installed on the valve cover opposite the valve cover with the pcv valve in it. Take off and plug the breather on the cover with the pcv valve in that one.
The idea here is at high vacuum driving conditions, the pcv valve will pull out the oily smoke and burn it. At low vacuum driving the pcv valve shuts off and the carb will draw through the hose to the nipple breather and burn it that way.
It will keep the outside of your engine clean and the inside too. Plus it adds a little bit of oil to the top of the piston rings to make them last longer too.
Hopefully it's something simple like this and not internal problems.
Your car is really cool!