i just started working on an engine finally to get back to the gbody scene. im trying to figure out what kind of aftermarket oil pan has been used for a 3rd gen 350 also known as the center bolt head sbc without it being in the way of anything. i believe these blocks are a 1 piece rear seal and just want to know what will fit my application without having any problems of the oil pan hitting anything. brand and possibly part number would be appreciated.