I have been running a coil for 20 years. They don't "wear" out but they could rust away. If you are going to continue running points you should keep a good dwell meter on board and keep reducing point gap as required to achieve specified dwell. When I finally switched to EI I had a distributor set at .003" that would still achieve 31 - 34 degrees. But the point replacement nterval just kept getting shorter. I think I "milked" that distributor cam for about all I could.