Back in the '70's STP was the cam break-in lube of choice. I used it may times and never had an issue but then again oils were better and lifters were US made.
The first time I used it, I poured it down the length of the cam and spread it out by pulling the cam back through the palm of my hand and then poured some on the "dry end" where I was holding it. It was so slick you couldn't grip the ends of the cam to install it. I threaded a long bolt into the cam sprocket so I could install. Made it a habit to coat the cam bearing journals first, install the cam and then dose it with STP from above afterward. Very slippery stuff.
The last two motors I built for myself I just used 30w motor oil and the cam maker's moly paste on the cam lobes and lifter faces followed by priming the motor with a 1/2" drill and oil pump priming tool.
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