I think the '73 is still a -200 model with the Hershey Bar wing right? I've got a bunch of time in a '71 -200, an older -180, and then some more in the -201's at FSI.
Anyways, they're nice planes (as long as the auto gear extension is removed/disabled- that thing is a pain in the ass). They tend to sink like a rock, so when he pulls your power in the practice area, look down. And when he does it in the pattern, stay in close to the runway. If its abeam the end of the runway, go straight for the numbers. Keep some power in on landing too. They don't float like a 172. On takeoff, the older ones (-180's, and I think the -200's too but maybe not as much) have an over-rotation tendency (from what I understand, caused by the relatively small elevator but I don't remember the aerodynamics of it, so dont ask
), which causes it to continue pitching up after rotation. You may notice that after you rotate, you'll need more additional forward pressure right away to keep the nose from continuing to pitch up. Its not super-pronounced, most people don't even notice it until you say something. I just mentioned it so you can watch for it.
They're really nice flying airplanes though, and they don't have any real bad quirks. I spent many hours flying that -200 around the southeast through bumpy and rainy clouds in the middle of the night (yeah, I know, not the smartest thing to do for fun probably- but I was usually solo). I had block time in it, and flew it almost exclusively at night. I miss flying the Arrow.
Have fun!