Working on a friends 56 with 292.He has a rebuilt NORS Teapot carb.It was leaking so I replaced the brass cover over the needle and seat with a new one from Casco.Leak fixed.Now it wont idle smoothly in drive and the mixture screws have no real affect on adjusting them.Any suggestions on what to look at.We put the old carb back on and it runs better than the new one so I dont think there are any vacuum leaks.Also noticed the needle and seat were new style soft tip with NO clip attaching needle to float.Good idea to change it to old style steel with clip?Other thing I noticed is the distribtor timing advances at idle when you hook up one vacuum line and then more when you hook up the second.The springs in dist. are not broken.I thought timing was not to advance until off idle driving.Am I wrong or is there something not correct with the Loadomatic?Thanks!