Hummmm, cruise RPM explained ???
Well, at what speed do you drive down the Hwy. at? 65, 70, 75 mph?
Note this on your regular car. I'll assume you will want to be able to do the same in "The Ride."
Also understand that as cams get bigger, not only will they Increase the HP of the engine,, but, it will also increase the RPM range at which the cruise in. This should work in conjunction with the gear ratio and tire size. (Also the stall speed of the converter.)
The gear ratio can limit the cam size which in turn limits power to a degree.