Gerald post all you want there ain't no limits and that is the purpose of Moparts. Just me I'd get a 400 block a 440 steel crank 440 rods (those would be fairly cheap) and the big expense would be the KB 280 pistons & offset grind the crank. that'd give you a ton of cubes (470) in the same B width pkg you have in there now so the alt/ps would fit back up perfect & if you have HP manifolds/good mandrel bends ex system it would fit right back up also. Post any Q's and how you decide to go