I talk about that throttle stop bolt as an afterthought, because it just doesn't add that much in terms of performance or rpm. If it's not adjusted in far enuf, then your power will be somewhat limited. To adjust it, loosen the jamb nut with a 10mm wrench, then screw the bolt in with needle nose vice grips or a small allen wrench inserted in the hole. No issue with using the pix, that's what they're there for. I have more on my photobucket page.
Spinning to 2500 is nothing, you can hold it at 2800 for hours, but fuel economy will greatly suffer. Plus, you can go to 3200 before valves start hitting the pistons. These engines can stay together up to 4500rpm, not that they need to spin that fast, unless you're at the tractor pulls.
You will gain more rpm by first upping the fuel rate(sliding the plate forward), then tightening the gov springs if the first isnt enuf. Just sliding the plate lets more fuel flow and it will pull harder thru the rpm range, and start cutting off about 2750. It takes fuel to get more rpm, so you wont get much result by just doing the gov springs by themselves. Doing the fuel and rpm will really wake it up though.