(1) Contact the National Air and Space Museum (NASM) at the Smithsonian.
Archives Research Request Expect to wait a month for a reply because they are woefully understaffed. The Technical Orders/Navaers/Navairs (manuals) you need so you can identify the interchangeable parts are underlined below. [EDIT Later revisions will include parts used on later model engines]
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The -86A is a USN engine so I do not have a list of manuals for it but the NASM will be able to give you a detailed list of their holdings and the cost to copy each one.
(2) I know how to find the date of acceptance into the USAAF for engines attached to aircraft but not for navy ones. As a first I would again try the NASM and ask them also what make and model aircraft these engines were fitted to as well. If it was an AAF engine I could advise where to find the records for which exact aircraft each engine was originally fitted to but I have no idea for navy aircraft. The NASM can probably help on that one also
(3) For the prop contact your local prop shops and DC-3 operators and see what 23E50 props and parts are available. The 23E50 fits all Pratt and Wright engines with the shaft your engine has.
(4) tooling - have fun. NASM may have drawings and you can check the 1820 technical drawings in the National Archives of Australia. There is a link on one of the other forums on this site.