In the very near future, I will be selling a 1967 Mooney M20C. It has great avionics including a Garmin 430, modern Narco secondary nav and com, modern transponder, 3 axis autopilot, good paint and nice leather interior.
If someone wanted a Mooney that already has good avionics, autopilot, etc. this would be a good one to consider.
I will probably put it on the market in December or January. If you know anyone who is interested, please PM me.