Sounds good to me! How far down in the bore are the pistons going to be? You may want to go through those heads before you slap them on your engine. I've read some scaring things about those heads on this web site! Also go with the valve springs that your cam calls for. Have you fired it up yet? If not make sure you use oil with plenty of zinc/phosphates and break-in oil. I too have a 69 383 that I had rebuilt a couple years ago with those same pistons. Also make sure you gap the top rings the way Keith Black recommends them.