I just replaced the lines using the same kit you cant go wrong mine had some cheap silicon lines that looked like an hour glass .My upper intake manifold gasket was leaking too the part of the gasket was gone both of these problems created high iac counts just follow there diagram .
Should the ac cycle at idle ? It does have the adjustable pressure low pressure switch . The system was converted to 134a with a new drier and ac delco compressor it seems too cycle while driving and its pretty cold .