Here is a list of vendors for your BIRD. The trany mount may prove to be difficult as FORD used the LINC TWIN-Range Turbo-Drive (LX) behind the 430 (which is actually just a heavier version of the COM).

http://vintagethunderbirdclub.org/links.htm

http://www.squarebirds.org/links_squarebirds.htm

http://www.tbird.org/sites.htm

Let us know how you come out as someone else will most likely need a source also.