If you have baffled valve covers then the PCV on one side going to the base of the carb and the other valve cover would need a breather to vent to the air filter. It's a simple system if the correct parts are used and the engine is in good condition. To test for cylinder sealing I would recommend a leak down test on all cylinders.
BTW, the PCV breather system is used to remove water vapor and blow by from the crankcase.
Forte's Parts Connection
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The Early Ford & FE Tremec were also originals from Mike. The Mustang firewall adjustable quadrant kit also is an original from Mike. His latest developments are external slave clutch release conversions & cable release conversions too.
Tremec Elite Distributor for: T-5, T-56, T-56 Magnum & TKO-500 & TKO-600
TKO-500 & TKO-600 Midshifter, Front shifter, offset Corvette shifter and more...
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FORD RACING & QUICKTIME DISTRIBUTOR. NEW 5 LUG AXLES & BRAKE KITS & NEW 8.8\" REAREND IN BOTH IRS & FOX AXLE.