I'm constantly blowing out the valley pan rear seal, and after talking to a few engine builders, they recommend running a PCV valve and 2 evac breathers. I've been running a PCV, and 1 breather on the passenger side. The driver's side I've got a breather on now, but can't get the darn thing to seal since it is a twist on factory style. I've doubled the gasket, and tapped the ears down to tighten up the seal, and I'm still blowing oil out of it. So, I'd like to have the added evac into the air cleaner to use the vac. created by the carb to evac the crank case. So I'd like to run a PCV, 1 evac breather on the passenger side, and I'll try and seal up the breather leak on the driver's side. I've also got a new aluminum valley pan I'm going to install to help cure the problem. I'm just tired of sending oil down the back of the motor down onto the clutch setup. If anyone has a better idea, I am all ears...