General questions from a new owner

First let me say I am not a tec, But I would check the back space on your front wheels, They may have less back space then your rears, or vise aversa
I would pull the drive shaft and change the u-joints, if they are squeaking they may have not got greased before they was installed and it's a cheep fix, Me, I would have to take it to a shop and let them change them or let my son change them for me 8)
The rear seal could have been changed out, How much is it leaking ?
I put air shocks on my 66 till I can but new springs in, I have never used helpers on a car before
I am sure some help will be here soon 8)