Youre a brave soul. The very next thing you should consider doing is joining the AEHS :http://www.enginehistory.org/. There you will find all the help you will need before you spend another dime. Just nose around the site and join up. You will find all the resources you will need for your project. I have an R-2800 I'm building and there are several folks with 3350's, 4360's, R-2800's Allison 1710's, Merlin 1650's and engines you've never heard of operating in your neighborhoon, or close by. There are parts and part rebuilders and manuals you will need. E-bay is an excellent source as well as guys in the AEHS getting rid of their stuff.