You say roller rockers! Is the cam a flat tappet? If it is a flat tappet it should have been run up to 18-2000 RPM for about 15 minutes, they rely on splash for initial break in with a roller it does not matter. Once you get it in the boat you need several hard pulls to seat the rings, don't baby it or it will be a smoker. No extended high RPM varied up and down is best for about 10 hours at which point an oil change is in order then have fun!
+1 on the risers real important!!!!!!!!!!!!!!
No matter what your beliefs are "GOD BLESS AMERICA"
Fully retired marine tech near 60 years in the biz.