Oh,no here we go again.The great 400 debate.Again what Matt has said takes care of it for me.Of course there is the way short 5.565 rod that causes early wear of the piston skirt,the cylinder walls and the rings.Like I have said before I have a couple of them sitting around the shop with cracks in them.If the price seems fair to you then go for it.Me I would stick to the 383.If I want any more cubes than that I would buy a Dart or a Motown block.