Break in cam with new Schumacher ceramic headers?
Put 40-45* timing on it when breaking it in. If you run vacuum advance on an engine, it likely has more timing than that WITH a load driving down the highway.
There is no load on the engine when breaking it in. Timing numbers can be increased without issue.
Done a bunch of ceramic coated stuff and never break in with a different set of headers if the engine is in the car. Timing is the most important element.