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The design staff at Olds was fickle with cam and lifter designs, changing lifter angle and bore sizes several times over the years. The large diameter of the mid-'80s 307 lifters makes them desirable. To take full advantage of their size, however, requires having dedicated cam lobes designed at over a thousand dollars a pop for intake and exhaust. Using the Mopar lobes gets you 90 percent of the way there, and saves a ton of cash.