I recently rebuilt a stock 350 Chevy complete with New Cam and lifters. Run in only required using either oil with zinc or an oil additive with zinc.
I've been building engines and messing with cars for 50 years and until zinc was removed from motor oil I've had no problems with engine run in. My procedure has been 0 to 35 back to 0 briskly 4 or5 times. EFI engines have learning computers they adjust to your driving habits so run them in by driving them normally for about 2000 miles change the oil to your favorite brand .and get after it. On all new engines rebuilt overhauled or patched ie. cam and lifters use zinc additive or motor oil with zinc and avoid overheating and extreme duty for 2 to 3 thousand miles. I Also believe that zinc is helpful in seating piston rings. Zinc was probably removed from oil by the EPA.
Stupid EPA.