Alan, Imero
Alan, could not agree with you more. There are a lot of pitfalls when looking at 337's. High time engines needing new cranks can cost a bundle.
A low time aircraft can be a nightmare, moreso than one with 8k hrs. You get what you pay for.
Don't skimp on a good pre-inspection and go into it planning it is a dud and be happy if it is better! Better yet find one there are good constant service records that reflect a conciensious owner that values his (her) derrier.
If you find one consult the board as many here may know the AC or can do a prelim eval.
A normally aspirated 70 up 337 should do the trick with king radios and good times. A new Garmin 530 is probably a mask for deeper problems.
Then find a good lawyer to protect your investment <G>. I think you need to be prepared to spend 80-100k. We have a boardmember that lives in Miami that has just been thru this and found a nice one this summer. Maybe he can make some recommendations.
Bob