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I also feel the oil is a factor.
I have been using Mobil 1, 15W-50 since that is the only Mobil 1 viscosity that is designed for performance use and "muscle car era" engines. My last two cam break-ins have been using Rotella diesel oil with STP, then switch to the 15W-50. And no inner-springs... Other oils may be good to, but some lack significant amounts of extreme pressure, anti-scuffing, zinc, additive.

idling is bad for a flat tappet with heavy springs too.





Also take a look at Mobile Delvac synthetic (deisel target market) and the Mobile Truck and SUV synthetic. They are both exactly the same once behind the labels from what I hear but the SUV version is cheaper I hear (I can't find it locally yet dammit) They look real good for racing too from the additive specs I have seen.