What differences are there between a 70 e body floor shift manual steering column and and a column from a year or two later? I know the 70 had reverse lockout and the later style key release is different. I also understand there is a difference in lenght between manual and power steering columns. Is there a reference guide for measurements?I have a later than 70 floor shift column and was wondering what steps would be necessary to convert it to a 70 column. I have no idea if the one I have is from a manual or power steering car. I see you can buy the 70 column collars for conversion from column shift to floor shift. Any advise would be appreciated.