it's not possible on a 385 series engine. On an FE the caps go down into the block on a 385 the bottom of the caps is almost perfectly level with the oil pan rails.
you can buy 4 bolt splayed caps from blue thunder I believe that work on most blocks, or use a DOVE-A block with thicker main webbing and convert those but start looking into the cost of converting them, and all the other stuff involved, and it's getting to the point that you are better off buying an aftermarket block with the thicker cyl walls allowing a much larger overbore.