Looks like you are going to have to do a lot of scratch building on this one. There is a build thread on Scale Auto magazine's forum. Here is the link:
http://cs.scaleautomag.com/sca/modeling_subjects/f/35/t/67905.aspx?sort=ASC&pi209=1
I plan on doing this conversion also to replicate the 1981 Citation my parents drove when I was a kid.