This is how I did a PCV on my 50 PU.This 235 has a Holley #1920 carb off a 60's Mopar slant 6,but notice the vacuum line is attached to a PCV port on the carb base? The several other PCV set ups I did were similar,attached to a port on the carb. Perhaps on your engine running the vaccum off the intake manifold causes mixture problems? But I'm thinking the Rochester has no vacuum port?
235 PCV


70 Triumph 650 cc ECTA current record holder