FWIW, there are at least three different stock 'Cleveland" front covers. The variance is in the timing mark and how it indexes to the main cover plate. Depending on what you have now, you may need to do a little trimming.
Summit Racing has an intriguing aluminum front cover for Clevelands listed for not-much-money. I built one a few years ago but if I'd seen the ad, I would have saved myself a day's machining!
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