Greg, exactly, some of the Engines I am mentioning ( some owned by AoK Racing) are far from Street Machines, as well as the Tractor Pullers, so wicked high RPMs win them races/competitions.
Yes I am guessing my 265 build will most likely spin up to 5 grand, am I going to drive it like that, most likely not, but it will have a power band and capability outside of the stock range.
Going down the road at 70 mph at 2100 RPM, that would be the lowest Im would spec for, think these engines might be happiest in the 2300-2500 rpm range...
In fact with some OD reductions and high rear gearing, the notion of cruising at 60 MPH at 1600-1800 sounds good in theory but try that on a windy day, or going uphill for a few miles, bogging is inevitable.