't worry about the rod bearing load unless your pushing the motor with a power adder above 700 HP total twocents
I use the smaller and narrower BB Chevy narrow rod bearings in most of my pump gas and drag race Mopar BB stroker motors, no issues so far above 750 HP and 7000+ RPM luck

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)