Is the 383 a better engine, or does the 440 just have more displacement?

Of course, the same crank that works in a 400 to make a 451 will make a 383 into a 426 variant (depending on bore) Or even larger if willing to drop the coin for balancing and other items needed for 3.915 or 4.15 inch stroke. But a combination with aftermarket 440 length rods (6.76) and these pistons will come close to balancing in at the same bobweight as a 340 with TRW pistons. With decent heads, it revs quickly, too! DODGE Ross Pistons 99894 Ross Racing Forged Pistons | Summit Racing