Hi Madstang
It might be worthwhile to keep checking out the posts of the people with the model years you are interested in. You may get a feel for the type of specific issues they have to deal with.
There are many vintages and categories of Mustangs you might start with, and there may be a certain year, body style and option package you would like.
Some people like to restore their own cars and some like to buy them done and continue the detailing process.
I like to do a budget for my projects and see how much car will fit into it!
Cheers Paul