Convert 170 from breather tube to PCV system

Who's trying to get you to pay $75 for a freakin' PCV valve? What, like, a special racing PCV valve guaranteed to shave nine seconds off your ETs or somethin'? Shishkebab. If you're building a special stroker engine, I'm guessing you're paying careful attention to piston clearances and ring gaps and you're going to break it in carefully, etc, so there shouldn't be unusually high volumes of crankcase gas to handle. The smaller valve for the 170 Slant-6 seems like it would imply you need a bigger valve for an extra-big engine, but you don't. The same V165 valve was used on everything from the 225 up through the 426, just as there's one PCV valve that was used on the '66 Studebakers with the 230 Six and '72 Cadillacs with the 472 V8.