Hi Greg
You will have to trim the front of the spring hangers for the Cal Tracks on a 63.
I know several people who have been running the mono leafs on a street car, one for 7 years on his 440 RT and all of them said they were fine on the street.
John Calvert knows what he is talking about on Ford suspension so I will give him a call tomorrow and ask him about running them on the street.
I am wondering about why he recommending not to run them on a street car as I have them on my 71 Ranchero and am going to install them on my 63.
Greg.