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With that much lift I hope you had the valve seal to retainer distance checked. Magnums do not have alot of retainer to seal clearance over .500 lift. I would purchase adjustable rockers, and use an adjustable pushrod checker to find out what length pushrod you need. Remember to check the rocker wear pattern on the valve stem tip.



, if you didn't have the guides cut down i don't think .580 lift will work.

75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU