When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Since they made the 350 for so many years is it an issue to getting the right cover with the timing mark in the same spot. I would image the timing marks changed over the years
That link is actually the cover I bought. They show 1 left in stock at $21.95 price. It's the replacement part for GM part #10243967 which is the L98 timing cover.
Mercury Marine's part number for it is #14249A2 but it's the same small block Chevy cover. If my link doesn't work correctly, just go into eBay and search on the Mercury part number at left.