Word of caution with the supplied large base gasket.........it may be too thin and it won't allow the base to fully seal against the block. I recall the old M/P the gasket was too thin. Mancini had a proper thickness base gasket that they used to hand out to anyone who bought the M/P 90* adapter gasket kit. The thinner gasket would allow the oil to drool down the side of the block. I got the thicker Mancini supplied gasket and no more drooling 340.