I hate to tell you this, but your "little 383" Is a small block, my "big?" 403 is also a small block. Im not expecting to just waste you all out, Im expecting a good romp across the miles. My 403 is newly rebuilt(cunundrum), I need to break it in. Thats why the 2 weeks, thats why the 350 heads, and thats why an oldsmobile. After all, why go with the crowd when you can be an individual?