what smallblock (with freedoms)

Does it have to be a small block? A 383 with a 3.125" stroke (3.375" stock) and a .030" overbore (4.25" stock) comes in at 360 cubes. Must work pretty well since it only took 3 or 4 races for NASCAR to ban the destroked Hemis when the displacement limit was dropped to 366 inches so Chebbies would have a chance.