I was afraid you were going to ask.
By law here in California the PCV system was required on vehicles from 1952 on. A PCV system is about the only smog system that is worth while. Since it burns off fumes in the crank case.
I installed about a 1/2 dozen on 235s in 64, when I worked in a gas station. There were several approved kits for 235s. One kit blocked off the road draft tube and the other eliminated the road draft. I believe a freeze plug replaced the road draft tube. The valve cover was vented and ran to the air cleaner. The breather on the valve cover was replace with a cap. Basically you blocked off the crank case, then added a vent with a PCV to the carb. The PCV keeps a backfire from igniting the fumes in the crankcase. :rolleyes:
There were some PCV kits that used a spacer under the carb with a vacuum port. I don't remember there being a spacer for under the 1bbl with a vacuum port. They did make that spacer for 2 and 4 bbls. What I'm getting at is block off the road draft tube with a freeze plug that has a 3/8 fitting in for pipe or hose. Run the copper pipe back behind the block and to a spacer under the carb. I don't know of any place to get to the crank case under the intake. You might end up with two dummy spacers, so the linkage isn't a pain.
Then again the road draft tube looks ok. I recall that some road draft tubes were cut on an angle on the back side and low enough to catch the air under the car. I can remember cars going down the road and belching smoke out the road draft tube.
Larry
