used the 10.1 pistons clean port the heads , have the hardeing seats put in cut the heads .045 shaved them run a thin .022 gasket and put a 509 cam run a 3.91 3.55 gear 2500 to 2800 converter clen the exhaust ports up a little and intake ports too u can do most of the work and it will run like ........... well you will be happy its the same set up in my orange duster