Motor oil weight for triton v10

This is one of those threads that comes up nearly monthly. The problem is we have a bunch who are still using what they learned in the 60s. The engines of today are not the engines of the 60s. The oils of today are not your fathers oil. I don't care what you think about the weight oil Ford calls out or what you think the reason they call out a specific weight oil. If I had a Ford V10 I would use Mobil 1 0-20. Hear is a fact the cams don't have replicable bearings if you gall or wear out a cam journal you replace the head. The tolerances used in the engine are very tight.
Bill