Great job with fabricating the intake manifold. The Webers, of course, look gorgeous.
There are 8 port "distribution blocks" on the market that are perfect for the PCV manifold . Tack it to the bottom of the manifold, plumb it to all 8 runners from underneath. This one is Edelbrock #76578.
Another neat trick for Webers (individual runner induction) is a separate electric powered vacuum supply for the brake booster. It eliminates the power brake vacuum plumbing as an eyesore or a plumbing issue. Providing vacuum to the booster this way is common these days for electric cars, customs, drag racing, turbo & super charger applications.
A few OEMs have small, quiet, electric vacuum pumps. Add a small tank for volume & a vacuum switch to turn the pump on & off. I think there are some all-in-one units too; Audi may have one that is popular. It is possible to make this look as OEM as you have the Induction system & air cleaner assembly.
Mount this vacuum "assembly" below the car, immediately under the brake booster. All that is needed is a 12 volt wire for power, and a short vacuum hose to the booster.
