Use the stock block and heads. BUy a lower priced internally balanced 383 stroker kit. Have the stock heads rebuilt with a 3 angle valve job and back cut on the valves. A bowl blend and reshaping the short turn on the heads would help but that is up to you. A hydraulic roller cam would help with durability. I would go with something in the mid 220's at .050 on the intake lobe with about .500" lift at the valve with a 112 or 114 lobe separation angle and 110 intake centerline. Have the Qjet rebuilt by an expert shop that can actually calibrate it rather than just rebuilt it.