How far to rev this 273 commando build

The point I was attempting to make, earlier, is that in order to find max performance shift points, you need a HP, or a torque, or an acelleration curve for at least one gear throughout the extended RPM range of the engine. With that done, you can plug the addtional transmission ratios in and find where the progressive gears cross in the curve.

There's no reason you could not fabricate a load cell into your motor mounts and use that