I tried using a large port behind the carb on my Edelbrock Performer intake to provide vacuum to my pass side rear located pcv valve. Hookup was a no-brainer until I started noting that my air/fuel mixture gauge was indicating VERY lean. Back cylinders weren't getting the same amount of fuel as the fronts and there was a noticeable increase in temperature in the #7 and #8 cylinders.
Switching the pvc pickup to the front designated pvc vacuum port of the Edelbrock carb solved the lean air/fuel issue. The small port on your intake isn't going to support a fully functional PCV setup. I think in your case I'd use a 1" riser block under the 2 bbl, tapped for a hose barb. That way you aren't causing an imbalance between the cylinders. Add the PCV to the pass side valve cover with a grommet and you'll be in business.
BTW.....capping off barbed vacuum ports with rubber caps WILL come back to bite you if you don't monitor their condition. Think I have picks of the PCV setup in my webshots "Hot Rod" album.
Dave
