I fail to see the attraction of a 383 stroker. If you're going to use the 400 crank, why not use the whole 400? More cubes, stock parts and reliability. The crankshaft is the weak link in a 400, if you got that anyway, might as well have the cubes. Why spend big bucks to effectively debore a 400? Cutting down the mains to fit a 350 block weakens the crank , making it more of a weak link.