I have used the moroso pump with no issues. I have one on the skyhawk and one on the procharged car. Both work great with no issues. Lots of street use on the procharged one also. Would never do any engine without one now. Stops all the swapping and leaks and makes power.
The R4 wet/vac pump can suck up oil into the vacuum breather. I would drain it each pass. I adjusted the vacuum also then I added a little baffle shield on the underside of the valve cover where the vacuum port. That cut my oil in the vacuum breather by half.. Briz, There's a new combo from Peterson I saw it on Yellow bullet. That might be what your looking for..
It hardly sucks up any oil, maybe a tablespoon of oil for a whole day's worth of racing. That oil doesn't go back to the motor, it goes into a catch can that you drain periodically.
I get bugger all oil in my catch can. I get more condensate that I am sure would put you on your ass if you had a sip of it LOL!!!!