I'm in Dickinson North Dakota, and it is pretty crazy around here in good and bad ways. Many stores are closing because they can't compete with the wages the rigs offer...even mcdonalds closed in williston. Anyone can get a $20 an hour job but you have to find a place to live. Also you are working and living with and around the scum of the earth. I'm a big guy at 6'3 and 230 and I carry a concealed weapon. It really is the modern gold rush.
But on to my engine, would you rather use the stock 400 crank and rods and sell the 383 short block, or use bearing spacers and use the scat crank and 5.7 rods from the 383. Then of course what is the chances of putting 400 pistons on the end of the rods and still being with 50 grams of the previous balance?