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You could NOT use a factory style roller setup if that is your original block; they did not set the blocks up for a roller cam before 1985-ish. You'd have to go with some sort of aftermarket design (read; way more expensive) to go roller on that engine. But as Mopars had the largest diameter lifters you can actually run a bigger cam than a Generic Motors engine could IF the rest of your build can support one. but IF you go Magnum heads with stock Magnum rockers, etc, your 1.6 rocker ratio will make any cam you use in that engine seem a little "bigger" as all 91-older SB Mopars only had a 1.5:1 rocker ratio. (you COULD go aftermarket rockers and find 1.5s for the Magnum setup but that would be a step backwards)

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