Yes, vent tubes would work nicely. But, the blowby flow would still have to get to the valve cover area. On a Stage II head, there is plenty of open vent area to allow that. On a Stage I style head, it's a different story. If I can keep the flow of blowby from getting to the top end, catch it at the timing cover, then the flow of oil from the heads will have a much easier time flowing down to the lifter valley to be picked up by the drysump pickup at the rear of the valley.
I'll keep an eye out for the pump. Thanks!
Here's something else to think about with my setup. The drysump pickup for the valley and one of the bottom pan pickups are T'd together to one scavenge stage of the drysump pump. If I was having big pressure in the bottom end and less pressure in the top end, what was the line flow like for that one scavenge stage?