assuming the 55 is also a GMC, not a Chevy ....
hood hinge mounting points are slightly different, but can be fiddled as long as you're using the 59 inner fenders and hood
wipers are different, entire 59 setup should be transplantable
55/6 column is longer than 57-59, but the 59 column should fit OK, or you could use the longer 55 column with the 55 wheel
59 firewall is slightly different but can be worked around
otherwise they're close enough for Alberta girls
Bill
