The starter is going to limit the size of a kick-out, especially if you need to service either one (leave room to reach the pan bolts, and drop the starter).
If you just need more oil volume without less ground clearance, you can add quite a bit to the left side (although it doesn't allow windage off the crank to escape due to CW rotation). A piece of 4 or 5" 16 gauge exhaust tubing, slit in half, can be attached to the wall as far down as you can parallel to the pan rail. Use a 1" hole saw on the pan side wall as low down as you can get. A 24" length of 5" adds about 4 quarts.
To figure out the best shape, get the length just above the sump. Now the height from the sump to the pan rail, subtract 1" for working room. If you have enough width, use the full 1/2 circle of whatever diameter is equal to the height (5", etc.). If there's less room, use less than the full diameter.
