I have this 83 mark 6, first off I can't get a mounting kit for it. SO i will have to make it work. This car has the Premium sound system in it, which you can turn on with a switch on the dash. I am wanting to hook a pioneer head unit up with a amp and cross over to my Kicker Square. What do I need to do to make this work the best? I would like to have the premium sound left in it but I'm not sure if I can with the pioneer head deck. all help will be appreciated.