A great resource for you would be Gary Tayman at Tayman Electrical. Gary is a Tbird fanatic whose car stereo shop specializes in Custom Autosound products and all sound systems for classic cars. His shop can also take an original Tbird AM radio and upgrade it into a modern digital AM/FM/CD system while maintaining its stock appearance. This guy knows his stuff and could be a big help to you. His website is
www.taymanelectrical.com. Good luck.