318 rockers and intake

I just read an article about a guy that used roller rockers on an LA 318 and it was pumping oil from the top of the valve covers. The editor suggested that he use a oil pressure regulator. His rockers are needle bearings. Mine has bushings. Will using this type of rocker cause more trouble than they are worth? Also, I read that the intake ports are different on heads that were OE 4v vs 2v. Does this mean that I will have to look for 4v heads to use a 4v carb?
Brian