in an 87 town car with the premium stereo.. which harness do i use??? i want to put in a pioneer deh-p8400mp and i dont know if i should keep the factory amp... and also do i need a dash kit?

Crutchfield.com shows the compatable stereos that'll plug in to the Towncar.
You may also want to try LincolnsOnline.com for more replys to your questions.