I have some 1956 parts listing for the johnson RD18 cousin if that helps……. file is big but if you need specific listings the johnson parts are likely identical .. up to you
Why don’t you check on eBay. Type in search, 1956 Evinrude lark and look at the listings for the 56 Lark. Usually there are some original paper parts catalogs you can buy for under $15.00. I always get the original parts catalog for the engines I work on. I refer to them continuously as I work on the engines. Sometimes people use incorrect parts in earlier repairs or put it back incorrectly. I like being able to page back and forth in the catalog checking part numbers etc.