I had a problem with Marti upper hose for 67 gt350 being too short. I do not think this problem has been solved after several years. I ended up buying a Gates hose to get the right length/shape. Of course may not apply to your 68 with the wider radiator, just saying Marti hoses not gospel, and he does not appear to be receptive to listening to the problem. It's strange because at one time he was supplying a correct fitting hose.