disc brakes and oil pressure

1/4 inch. use the pan to push the pickup down and then give it another 1/8 then install the gaskets. Some weld up 1/4 standoffs to the pickup edges to prevent the foot from sucking down to the pan bottom. I would gather 4.5 qts in the cold pan and scratch the dipstick as "full" taking into account the .5 qt in the filter. Baffles couldnt hurt as well as windage tray or crank scraper.