I had a '71 1800E (no P that year) and sold it in '81 for more than I
paid for it new ($5,000).  I had the rocker panels repaired. They had
rusted out. I went to a restoration shop that used all metal.  When
people came to look at it, they used magnets I had to verify that it had
no body putty.  They were impressed.  I had people come to PA from as
far away as New England. It finally sold to a guy that lives about 40
miles away and wanted a second one for his wife.  The restoration shop
had buffed up the original paint and it looked real good.  The only
thing that looked bad was the leather seats.  They get crazed and the
plastic beads on the sides get worn.  I interchanged the passenger and
drivers seats so that the wear would be toward the inside where it
wouldn't show. It is a great vehicle but turns like a truck when you are
parking it.  No power assist on the steering and the quick turn ration
make turning when moving very slow very hard.  That is the only
drawback.  Also, the fuel injectors leaked gas on the engine.  It took
quite a while to come up with a fix that would prevent this.

There is one on ebay that is going for $4,000 currently.  It erroneously
says 6 cyl.; the photos show it is a stock 4.  Also it needs a lot of
body restoration.  Also, the engine is filthy.  It hasn't been cleaned
up at all for the sale.

It is at:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=6458&item=24891231
18&rd=1