What oil is best for engine break in????

[Mr. Chevy]

Gonna be breaking in a stock 396/350HP motor w/hydraulic camshaft. I was told by several people that Joe Gibb's "BR" engine oil was the best for engine break in. It is a 15W-50 viscosity and has high levels of zinc and other additives in it for good ring seal and lubrication. I know traditionally high levels of zinc were for the solid lifter motors but I was told it wouldn't hurt my particular application, in fact it would help...

I went to Gibb's website and saw that they also have a "BR 30" which is a 10W-30 viscosity oil and only difference from the regular "BR" was the weight/viscosity.. I am considering the 15W-50 oil over the 10W-30 since the motor is a big block. Any thoughts or ideas what is best or what some of you out there have had good success with????

Thanks.... Rich