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