This link to stove bolt PCV:
http://devestechnet.com/Home/PCVInstallDeve has done all the testing and actually offers a kit of those not able to make their own.
As far draft tubes and dripping......... they dripped d from day one and do a really poor job of venting the crank case. There is really good reason PCV were introduced and your engine and driveway will thank you.....especially if you fix all those other leaks. Not to mention less fumes getting into the cab.
There are several posts on the topic on this forum.
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1257565/2.html