Sounds like you either have a 318/340 pan, or a magnum style.
The M306 pan is new. Looks like a stock pan with added baffles. Not sure whether or not you could use the stock pick-up.
The M302 has 1 qt more capacity. This is the one I'm referencing and would recommend for a stroker motor. It will hang down just a bit further (1/2" judging from Kevko's specs) than the stock pan, but won't significantly compromise ground clearance. It requires the use their pick-up.
The stock pans lack baffling, and have very limited capacity. I'd be concerned with uncovering the sump under heavy acceleration. I wouldn't even consider running a HV pump with one.