Well it really depends on whereyou take it. The dash kit doesn't matter as long as all your signals and horn etc stuff like that works. you could try and make some bottom plates that just go with the conture of the rails and load the crap out of them with gravel guard so you can really see what they look like. Leaving it stock is the best way to go before the saftey though, the more mods you have the harder they will look.
Most shops (including mine) know these cars have garbage frame rails and will probably look BUT you never know.
I just racked up the front end on my grand prix 2 weeks ago ( GOD DAMMIT!) but I'm going to get a full front clip on sat. i just replaced the rails on my car and I still have 3 of the 4 body mounting plates that the frame bolts to (if you want them, you can have them). You only need them if your mounts are all rusted through.