I installed a 57 chevy frame to where I had back halfed my pro street 55. I know the one difference was the bumber horns which I redid to accept the 55 bumpers but I am having problems with the clutch setting not being able to get enough free play. is the pivot ball bracket location different from a 55 to a 57. I have made patterns off of a friends 55 chassis using the lever for the column shift and the oval hole and the small hole in the chassis and they are different from a 55 to a 57. Planning on converting the z bar to 57 and I am using bracket for aluminum bellhousing which I won't have to straighten out but also notice the only other part different is the clutch pedal push rod is different from a 55 it looks longer. trying to make patterns off of both to see if I have pivot ball bracket on frame in correct place. anyone know the difference in both frames in clutch area. would appreciate any help.