The issue yo uneed to be concerned with when using a B1 head is getting the oil back to the pan. Especially if you are running a vacuum pump, that is going to fight getting the oil back n the pan. IMO the bigger you can make those drainback lines the better off you will be. Oil control n a BBM is always gong to be an issue. I see most bandaid that buy running a huge quantity of oil, which works but does not cure the problem. It is just inherent with the design. Better pans, scrapers etc all help.