I've never done it, have no need to ever do it. But on a long hood, (Red Face) keeping the tank in place I can't see any real issues. Get rid of all the angle iron supports, and replace with flatbar. May have to slide the tank forward just a bit to clear the back of the engine. If you can't take the hood forward, notch the hood hole a little and cut a bigger rubber gasket. On my Red Face the front of the tank is only about 1 inch from the rheostat.
When you lower the radiator, and lose the battery box, wonder how hard it would be to mount a battery over the oil filter?
Now on a shorthood they just didn't leave a lot of room to lower the tank.