[JSeery]

Anthony, you may have missed something on the PCV valve discussion, it does a lot more than protect from a backfire. When you install the PCV system you are creating a large vacuum leak and this involves more than vacuum advance on the distributor. You are allowing air to enter the intake manifold that has not gone through the carburetor ventures. So, you are leaning the A/F ratio way out. It is now running lean. The PCV valve limits the amount of air (vacuum) leakage at high intake vacuum conditions (idle and constant speeds). At low vacuum conditions the PCV allows more crankcase air into the intake. Under these conditions the engine is less sensitive to the vacuum leakage. It still has an impact on the A/F ratio during acceleration however and most likely the carburetor would need a power valve or accelerator pump adjustment to correct this.