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Since you are not looking to squeeze out every ounce of performance that a 289 is capable of, I wouldnt worry about roller rockers. Yes, roller rockers may be superior in many ways as compared to the old stamped steel rockers, but they also come at a premium price. Unless your originals are excessively worn and need to be replaced, I would re- use them. If you decided down the road you wanted to change them anyway it only cost you a set of valve cover gaskets.
Just a note, You can also switch to higher ratio roller rocker if you wanted a little more valve lift. Same as installing a cam with more lift even though the duration would be the same.
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