60" is way to long you will be draging your lower links on everything and it will make ledges/stairs very difficult Shoot for 40" lowers and 30" uppers.
X2
i first made my lowers 52" and relized that they where too long then went down to 44-48 cant remember, they are still a little long. my front links are 36" from tube adapter to tube adapter so they prabable measure out 42? eye to eye. to me what i've kinda figured out is not to go much more than a couple inches longer than your tire size, its kinda a good rule of thumb i thought of. i would also try at the least to keep the top of your joint level with the bottom of your frame, if not higher.
