theres a stock cast oil pan available as a replacement kit ,

basically its shallower at the front and the sump section is further back

it was designed to give more clearence to retro fit the ls series into older cars where cross memeber and rack clearance is an issue ,

with one of these and imo the minorest bit of modding and making up your own engine mounts , the ls will slide straight into a cos engine bay ,

lol dont get me started , still tempts me every day lol