You need the centerbolt covers started in 86/87 for all small blocks. Summit has chrome ones for about $40, or you can get the covers ( Don't forget the torx bolts to hold the covers to the heads!)from the junkyard along with the special self aligning rockers you need with the Vortecs for cheap. Or new from GM almost $100 for all the parts, covers, bolts and rockers, PN#'s are detailed in a Recent Hot rod article.
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