PCV valves are hard to get right for a big aftermarket engine. If you have a bone stock 1966 390, then yeah, you can probably get away with throwing a factory replacement PCV valve in and roll. When you're working with a 650 hp 482 FE, then no, it's likely not going to work at all.
You don't know how many phone calls and emails I've fielded over the years where guys are sucking
oil into the intake, engine is smoking, etc., because the PCV is bad or incorrectly sized.
You don't need vacuum in an engine, per se, you need venting. An engine will not blow gaskets and seals if it can vent the crankcase.