If your going to replace those hose clamps I would check the hoses for cracks and replace if necessary. LOT"S of YouTube posts on radiator flush and almost everything you will ever need, or not need to do on the "A". Always watch the videos with Les Andrews red book nearby and make sure things line up.
I did a vinegar flush on my car, rinsed with water and baking soda then filled it with 50/50 anti freeze and distilled water. Because I am in Arizona I added a bottle of water wetter.
Sometimes overheating is caused by wrong advance/GAV settings. My car loves running at about 45mph with the advance lever (left one) at about the 9:30 position. GAV open about 1/2 turn. If it starts to get hot I just slow down to 30-35 and she cools right down.
Try a lock washer on that Generator bolt.
Here is a link to the Operating Manual which is full of info.
http://motormayhem.net/wp-uploads/20...ion-Manual.pdf
Enjoy the adventure... Chap