I would say very little boost if any, under ~5psi. Do a lot of vacuum pulls (ex. bring it through the gears being nice and easy on it, then let off the gas and let the motor slow the car down, downshifting along the way to pull the motor into vacuum.) I hear this seats the rings good, I have seen it work for others, and it has worked well for me also. The first miles are the most crucial, probably 0-20 or so are the most important for seating the rings. Also, let it go through a few heat cycles along this process. Don't go the whole 20 miles in one shot. Come back and let the engine cool down for an hour or so, then take it out again. Also try to drive at varying speeds, don't just get on the highway and set the cruise. DO all of this and you should have a happy and healthy motor.
