The stock engine was as stated. Street engine with a fresh .25 (first overbore). I removed the rotor from the engine after setting the timing. I retained the stock carbs and jets. I did file the carbs out a little. I reused the original head and base gasket, but gave 'em a bit more torque (no, they don't leak). I did not degree my cam, just set it to the factory mark. No tricks at all. Of course I run total loss ignition. I weigh 145lbs. a little heavy.
I'm not from Texas and I don't have anything to prove, I just like ridding my motorbikes. I put this engine together as a spare the night before a race. The simple engine allows me to circulate the racing course. I call that fun.
The 160 valve cover is used to help brace the steering head. The wider spread of the 160 valve cover and its 2 (or 4, depending on how you want to view it) ad a little more rigidity.