Budget about $3500+ so you will have enough left over for beer when done. Use a hydraulic roller cam, but expect noise form the noisy Comp lifters. Flat tappet "can" work, but oil issues will reduce longevity. If you use a flat tappet cam, be SURE to use an addative, and use Shell Rotella, or specific racing oil, over the LIFE of your car to keep it alive. The level at which the engine is rebuilt, will detirmine the cost. Anywhere from $3,000 to $20,000 for a SERIOUS hardcore build. Cheap and good don't live in the Turbo Buick world.