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Our $300 Vortec 350 core came from AA Midwest, a leading core supplier. Our '98 vintage engine had four-bolt mains, a factory roller cam and serviceable crank, rods, pistons, roller lifters, and oil pump. After jet washing the block, honing the cylinders (with no overbore), putting in new cam bearings, and resurfacing the deck, we were ready to go. These operations are best handled by a pro, and we used the services of Speed-O-Motive in West Covina, Calif.