There is a 1955 coming up at an auction this weekend I was wondering about.  It is a row crop with a wide front, 3 pt, single hydraulics.  The rear tires are about 40% and solid.  One front is new and the other is bald.  The tractor starts good but lopes at an idle and puffs whitish blue smoke all the time.  There is oil seeping from the junction of the exhaust manifold and the head.  I susect that this tractor needs to be under a good pull and it would probably run better.  The over/under hydraul shift seems to slip in the low side.  What would cause this?  What do you think this is worth?