We had a mild 383 in my sons Dart that ran very good. It was a stock shortblock that I rebuilt. I used the stock factory pistons and decked the block some. It was not bored as I honed the cylinder's and used .005 over rings with the stock pistons that I knurled and fit to the cylinders. The piston was still .030 down so I milled the 452 heads I used .060 and used the steel shim .019 head gasket to get 9.5 comp. All I did to the 452 heads was some mild bowl blending and added Comp single springs. I used the MP .484 cam on a 104 centerline with the stock rockers and pushrods but I had to shim the rocker shafts to get .020 lifter preload. We put the Eddy RPM intake on with a 750 DP and I used a stock electronic dist I recurved. Of course we used headers and a 727 with a manual valve body and a Turbo Action 10" tight 3000 converter. It had 3.91's and we used McCreay G60-15 tires with the stock leafsprings and air shocks. This was all in my sons 72 Dart that weighed right about 3600 with him in it. Never dynoed the car but it ran a best of 12.31 @ 110 and I guessed it made about 400 flywheel hp. It actually ran faster then I thought it would as I was just looking for high 12's with it. Here is a pic of his Dart that runs a .030 over 400 now. Ron