What area of the country are you located in? A bit further down on the SN forums page are the local sections. You can post in there and hope for some help. Or you might get lucky and have someone on the 5.0L section help you out.
You can use the yellow pages to find performance shops, but sometimes that is iffy IMHO.
Performance shop... better yet go to a local mechanics shop and ask if they know anyone who could do it on the sied. A lot of guys I know will do it for $100 - $200 and a 6 pack