Sorry for cross-posting - I have no idea where else to look for info...
I've just inherited 3 stationary engines from my grandfather - a John Deere,
an IH McCormick Deering (with original owners manual & spare fuel tank), and
a Fairbanks Morse. They were all in (seemingly good) ...

I'm looking for some advice: my in-laws want to sell their 1972 'Cuda and
have no idea what it's worth.  They bought it new in '72, have garaged it
every winter, have all maintenance records.  This car is bone stock... all
the numbers match.  The only thing they've done to it was to ...