Personally I wouldnt use a syn blend oil on breakin.

Alot of guys do it without issues, but....

Id use Rotella and a bottle of Comp Cams or similar additive.

I go a little over board with my cam break ins. A local machine shop has oil that they had a local refinery formulate for them. It is chock full of zinc. I use their oil, and 2 bottles of SLOB.

72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.