I don't know of any illustrations, other than possibly an original service manual. The engine must have some crankcase ventilation, so use the block vent with the original canister under the manifold as an attachment point for the PCV valve. Run a piece of crankcase vent hose from the block vent toward the back of the carb (I think it's the same size as 5/8" heater hose) and insert a PCV valve into it. Plumb the PCV inlet to the big fitting behind the carburetor, 3/8" vacuum hose, IMHO. Then let the vent air into the engine through a vented valve cover oil filler cap. Problem solved!
Jerry

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