After replacing the lower control arm bushings on my 1966 ChevyII I took it to the alignment shop and the mechanic said that after the alignment it was pulling very hard to one side, After an hour or so of double checking everything we realized that the wheelbase was an inch off from the left side to the right side, all the front and rear bushings are all good, has never been in an accident and the floors are original and solid.

Is this something that I should be very concerned with and is there a fix for it besides putting it on a frame machine to see where the problem is?