Anybody using Driven brand HR-2 oil in their slant?

When I bought my 408 from Blueprint Engines (hydraulic roller) they said to NOT use synthetic until after the engine has like 5000+ miles on it. They then changed that recommendation to something much higher. I used conventional oil since I would change it frequently and did not want to spend tons of $$ for no reason. My current engine is a solid roller with Harland Sharp roller rockers. I contacted Lake Speed for his oil recommendation and he recommended the GP-1 (15w/40) since it was a synthetic blend with ZDDP and was designed for just such a build. He said the needle bearings in the rockers will like the ZDDP. I used the BR oil for initial breakin.