Thanks for the response Jim. You are correct that in the older carb vehicles, vacuum on the line to the advance on the distributor goes up with higher RPMs. That is good. That is what we want. Especially with water injection. However, I am wondering if the vaccum available is adequate enough to run the injection, PLUS have enough vacuum for the advance on the distributor. OR, would there not be enough resistance, and the intake manifold would see it as a vacuum leak????

As for the PCV line to intake, I am not sure if that vacuum is highest at idle or at higher RPM's. Something to look at this weekend. If the vacuum increases at higher RPM's, then I would prefer to inject water or Hydrogen at that point, because it would leave the vacuum for the advance on the distributor undisturbed. On a fuel injector car, it can be totally different. Thx... mike....