I have drilled a hole in my Clifford rocker cover for the PCV valve. Do you think I need to also attach oil baffles similar to the steel slant 6 rocker cover and if I don't, what will happen?

What is the best way to attach the oil baffles?

It is a good idea to add some sort of baffle or oil trap so the PCV does not send a lot of oil into the engine.

To add a baffle, find some thick areas in the cover then bend a piece of sheetmetal to fit and contact those spots. 9The back of the fins is a thick metal area)
Drill some shallow blind holes and use small screws or pop rivits to attach the baffle. If you a good bending sheetmetal you can extend the baffle down the inside sides of the cover and it would just be a "slip in fit" and have nowhere to go.

For a trap, use a metal can with an inlet about 1 inch from the bottom and an outlet fitting at the top. Fill the can with screen and have some way to drain the oil that collects at the bottom. (I ran a small drain hose into the dipstick tube)
DD

Thanks Doc for your advice. I can now proceed with installing the baffles.

Please clarify your last paragraph about the 'trap' - I don't understand your comment.

If you do not want to put a baffle inside the valvecover you can add a "trap" or catch can into the PCV hose, between the PCV valve and the carb. The trap seperates the oil and collects it in the can.
DD