5000 heater core help

[randrews@post.cis.smu.edu (Robert Paul Andrews)]

OK,
I am no infuriated.  I just bought my 88 90 and am trying to sell my 85 5K.
As I was drivein gthe 5000 today, the heater core blew on me.  At least, that
is what I think it is.  All the coolant is coming in through the floor boards
and really stinks (phew ;( ) So now, I am stuck with dillema.  Fix it, and 
sell, or just sell.  And to fix, how should I go about it?  Does the whole
dash have to come out lilke on the 90s ( I will have to change the one in this
car as well)  Any and all help would be appreciated.  And Also:

WHAT would a fair asking price for this car go as.  It has 76000miles, 
new automatic trans. resealed rack, new radiator,fan,belts, timing belt,
water pump, struts, battery, brake pads, window regulator cables, CV boots.
Some with warranties on them still.  I asked 1850 but only got one response.
Too much?  Any thoughts.  PLEASE HELP.  You guys have been great in the past
and I thank you for it.  I hope now you can help again.  Oh, by the way,
all you had the power windows needing fixing, how did my help turn out?  Just
curious....
Rob
randrews@post.smu.edu