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the 90mm gm dbw tb does not have a vent on the unit. i was assuming i'd route the brake booster to the rear through nipple. and the front nipple would be for the evap. then run the valve covers to a catch can.
original setup was the stock l92 intake manifold for a denali truck. brake booster was at the back. pcv vent line on top went to the back of the driver side valve cover and the vent behind the tb was for the evap solenoid
The PVC return is usually on the throttle body behind the throttle blade (full manifold vacuum), the brake booster can connect to any large enough fitting on the manifold that has full manifold vacuum, and as far as evap, do you still have all the system parts? How did it hook to the OEM manifold? Keep in mind an intake manifold is just plumbing between the throttle body and heads. Anything between the throttle body and heads is full manifold vacuum.
this is what I have landed on as the best plumbing option
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