Get the scoggin dickey short block,vortec heads with beehive springs and rpm airgap ,change the cam and you will be at about 350- -375 hp.I have this build in one of the vizzard books,if you want I can type it out here?He starts with the long block and changes intakes,then heads ,headers and gives the dyno numbers along the way.The build I listed is the end result,so I could post a tamer version of this too.