[Sharps40]

I have a 65 manifold on it....the only vacuum port is as you say, the square plugged port in the photo above.

My manifold has a boss, undrilled, for another port at the junction of the plenum and 3, 4 cylinder runners. (I believe 67 and up c10s pulled pcv and brake from these two ports, one on either side of the plenum.)

Don't want to drill it there now since it means pulling the entire intake....figured I'd wait till I have my new 2 port manifold in hand and have modified it for more direct mounting of the weber 2 barrel.

For now I'm not too worried bout trash in the booster, more concerned with maximum pcv performance. Figured if i have to temporarly share one source for brake and pcv it would be best to place the t directly at the manifold vice placing the booster tee between manifold and pcv.

I have seen some early 230/250 with a 2 port brass block on the single manifold vacuum port but not hooked up. I assume they were used to power both pcv and either booster or auto trans from a single manifold source.