Find out when transmission was last rebuilt.... check out how many miles on
the transmission thats in there now.

Check thoroughly for rust.  A lot of MoPars were unibodies (not sure
about a NYer) and therefore rust is a Big Deal.  Also see if it has the
Lean Burn system still operational; if it hasn't been converted to a
conventional carburetor pay special attention to driveability as the LB
systems are known to be problematic.

good luck,

nate

I certainly wouldn't tell you "don't buy it," I love the last of the
full-size C-bodies!

The main thing to watch for on a 70s Chrysler is the cam gear. They,
like all the big-3, used nylon cam gears to silence the chain chatter,
but the nylon gears deteriorate and the timing chain will slip, which on
some of them can put valves through pistons. Regardless of mileage, that
engine should get a new timing chain and gear set, preferably a roller
type (available through Edelbrock, Cloyes, etc.) The drivetrain is
otherwise just about bloody bulletproof- you really cant get much
tougher than a 60s/70s Mopar engine/transmission combo. Of course at
this age, it will need the usual maintenance- carburetor rebuild,
fluids, filters, rubber parts. RESIST THE TEMPTATION to get a
parts-store "rebuilt" carburetor. They're complete crap, if you can't
rebuild it yourself, send it to some carburetor restorer like the
carburetor shop (http://www.thecarburetorshop.com/Frames.htm). In fact,
resist that temptation with everything- starters, alternators, PS pumps,
etc. Lots of stuff is avaialble brand new- Edelbrock high-efficiency
water pumps for example, retrofitting Nippondenso alternators, Edelbrock
"Thunder Series" carburetors, and even modern AC systems
(classicautoair.com). Take a look at the under-hood of my C-body here:

http://lonestar.texas.net/~sglacker/MMCA/AC_kit/AC_Kit_Install.html

That's my daily driver so reliability comes first, hence the new
components you see such as the carb, alternator, and waterpump, not to
mention the AC. Keep the original AC if it works and doesn't leak- mine
worked great up until this year- but if the compressor is toast consider
the classic kit like I have.

Rust-proofing on that era Chrysler is "ok." Definitely far, far better
than the 77-80 F-bodies (Aspen/Volare) but not as good as a few years
earlier. Areas to watch on Mopars are around the rear window, in the
trunk, and in the rear quarter panels. Less likely, but worth scrutiny,
would be the cowl vent area, which can clog with leaves and debris.
IIRC, the NYer has concealed wipers, so its very easy to get at this
area- open the hood, remove the plastic screens below the wipers, and
carefully reach your whole arm down in there and pull out the muck.

Other than that, enjoy!