Tony, you might to want to check out Corral.net and do a search, there are plenty of guys that changed them out, here are a couple of links for you to take a peek at with pics also, its not bad if you have done it before, but if its your first time, it will take the better part of a weekend to do it.
http://pw1.netcom.com/~skent/mustang...ore/hcore.html
http://mustangmonthly.com/howto/5652/
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)