(1) You'd want a PCV that flows pretty close to what was originally in there & not sure how you'd go about referencing that to another make. (2) A filtered breather on one side with the PCV on the other side is correct. In '68 when the CAP (cleaner air package) systems came about the top (filter) side of the breather that's plugged into the valve cover had to go to the air cleaner so blowby fumes could never vent to the atmosphere which they would with an open filter system at WOT especially & would be worse as the eng wore out. If it has to be inspected I'm not sure if they would require that or not but aside from that there's alot of those open systems in operation just have the PCV on one side & the breather filter on the other side