Chris, do you have a part number or size?
In a related point, I have a Ford Racing 347 with the Z heads in my 66 Mustang. I bought the engine in 2008. I pulled a valve cover yesterday and guess what, it has orange seals. However, they work fine with no smoking or excess
oil consumption. Chris, I thought you had problems in all cylinders? If not, perhaps the problem is only in the cylinders with the missing tension clips?
Really glad to hear you got it sorted! Nice job!