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Why do you want to put roller rockers on an engine that has a cam that clearly doesn't need them? You won't gain anything measurable performance-wise. Flushing money down the toilet IMO. Now if you were to ditch the .509 and go with a solid cam or a roller, then you would have a use for those adjustable rockers. Spend the money on something that will get you some actual hp returns for your investment. 
I had a .509 in a 440 in my 69 Sport Satellite several years ago, and switching from the stock rockers to a set of 1.5 Crane Gold rollers picked me up from 12.40s to 12.20s and gained a little over 1.5mph. Keep in mind stock rocker arm ratio is somewhere around 1.42.
Pump Gas Small Blocks Rock!
11.53 @ 116mph E85 408 at 8500 ft da,
3605 pound truck, 3.91s, street driven
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