[shikzachaser]

I owned a stereo store here in St Lous through the 80s and have done a ton of Porsches over the years. The only difficult thing is replacing the rear speakers and even that is not terrible. The big thing is that you will need to either only use the new deck's Front or Rear speaker outs or ele eliminate the the stock rotary fader in the console bv the shifter. Either way he will not get big bass from 4 4X6 speakers. IXLOR8 has a thread "Porsche dash repair" and I put something in there on how I did mine.
If you get in a jam PM me, this is one area I am extremely familiar with. I just put together a "kit" for another member's daughter's 83.

Steve