I don't think there are a lot of mod motor stockers out there, although you see one now and then. However, they are very popular in other sanctions.
You will probably get more info if you ask on one of forums that are specific to the mod-motor.
A couple are:
http://www.mustangv8.com/forum/4-6-m...chnical-forum/
http://www.modularfords.com/forums/forum.php
http://www.fordforums.com/f499/
http://www.allfordmustangs.com/forums/4-6-mustang/
Not all are perfomance oriented, but the more you read about the thing the better off you will be.
Welcome to the non-government bail-out side of the world!