look what i found on ebay(and its something to look into)...
but since all the 3.8 guys whant 5.0's maybe this will work for them or even me since i whanna convert to true sefi soon.
http://cgi.ebay.com/ebaymotors/Early-Mustang-Cougar-EFI-Conversion-Harness-ford_W0QQitemZ8035779540QQcategoryZ33691QQrdZ1QQcmdZViewItem
but i thought this could be of some use for someone. so here ya go!