Will a 6 qt be enough?

Building a high reving (7000 - 7500 rpm) 340 for my swinger street/strip car. Have drilled everything 1/2 from oil pump up to oil filter and back over to rt lifter bore, drilled diagonals from rt lifter down to mains 5/16, cleaned up casting on upper end (under intake)w die grinder, drilled 5/16 holes between every set of lifters (for quicker oil return to pan). Going to be running a melling high volume oil pump. Would a 6 qt. pan be enough oil or should i go w a 7 or even 8? Had this engine togeather once w a stock pan. That was not enough oil. Spun #5 rod bearing by sucking pan dry and oil not draining back down to pan quick enough. Was able to clean crank up this time but dont want to make a habbit of it. LOL! Thanks for any input, Kevin