Not Ranked
Firstly,I think the hole you are talking about has coolant in it!! It would not be wise to connect a PCV to that!! You will most likely have to drill and tap a hole into the manifold ,and be sure that it does not hit coolant and goes into the crankcase.
A carb spacer first stops perculation, and second by increasing the distance from the throttle plates to the valve you increase torque!!
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