I have done a number of early B body cars and the offset bushings never got me much of anything. On a 62-3 you are lucky if you can get a true 1.5 degree of castor, offset bushings or no (and this is on 4 different cars). Most of these cars were 1 degree or slightly less. If you really want castor you have to go to some rod end upper control arms. I got a pair from CA somewhere and immediately got 5.5 degrees castor for a 62 Dodge I raced at Barona. Good luck with this, its a common problem.