The CPP rear shock relocation kit is very nice and for $55 shipped it's a great deal too.
It radically changes the angle of the shock and trust me you need it because you will notice a difference in the ride quality.
Buy it you won't regret it.
Here is a current link for it on ebay.
http://www.ebay.com/itm/1963-64-65-6...item58a0410820