It can have a trans case welded on. Be able to find the trans case recast. The geare are made new now.
This is rusty but still many good parts are here. The item "1917 Henderson Detroit Heath Airplane Motor KJ Excelsior Engine Deluxe K Engine" is in sale since Tuesday, April 2, 2019. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Antique, Vintage, Historic". The seller is "americanvintagecycles" and is located in Watsonville, California.
This item can be shipped worldwide.