Jay, hey, you've did everything else you can build that engine. I know you can do it. Any problems there is a great bunch of guys here to help you through it.
Should you decide not to do it, or have someone else do it maybe give this folks a call and chat with them. They are in Johnston, S.C.
http://www.cmengines.com/Home/tabid/36/Default.aspxMy nephew has sent probably a half dozen to them and each one has been "jam up" and actually saved some money. I may end up letting them do my 4.8