Out of curiosity, how would you divide up a pan into two pieces? I have a BMW engine that's two-piece but that was only because one is a skirt to handle the BMW engine being installed at an angle, and the other is the actual pan. My mental image of an A-series dry sump is basically a V bottom plate with just enough depth for the counterweights, and a small valley down the center where the sump collection tubes attach.

youd have a ladder bar for the first halve to hold the mains caps
no hoses direct feed into the mains from the pump like in the pic
below of the pump unitary with the pan which in a 2 piece would be
on the mains cap section then the cover plate seals it up.
http://cdn.speednik.com/wp-content/bl ... -The-Finished-Product.jpg
http://www.4m.net/showthread.php?2969 ... sports-billet-oil-pan-SBC