HotRonN, if your 383 is an older (pre-'87) block you can convert it to hydraulic roller lifters instead of selling it and starting over. Here's one of several articles that walk through the process - Converting a Hydraulic-Roller Camshaft - Tech Article - Chevy High Performance Magazine Being able to do your own machine work is a huge plus, so IMO the approach is to go through the engine you have and map out a detailed plan for everything you'll need to do to pull down your compression, improve your volumetric air flow, and ensure reliability with a roller cam. Once you have the plan, big parts down to nuts, bolts, gaskets and all of the machining you can put numbers against your shopping list and make an informed decision. Tech's one of the most down to earth, no BS sources for questions that come up about pieces & parts that you'll need, IMO. If the numbers don't pan out after you have the plan, then sell the whole shebang and start out with a later model, OEM roller cam block like Jerry is suggesting, or shop Chevy Performance and buy one from GM that's ready to roll, and comes with warranty.