The long action flat back recievers with the old triggers are my favorite. Those triggers can be tweaked to be really nice. I have mine downt o 2lbs that breaks like a candy cane. I refinish guns using Cerakote and KG Gunkote so I can tell you the rusty spots can be easily taken care of. Finally you have the action which can be changed to any caliber made with a barrel, bolt head and possibly mag swap out. The 6.5x55 uses the .473 bolt head so all you need is a barrel. As far as action bolts usually the two actual action bolts are flat our rounded Allen heads. The rear trigger screw is just that a screw not a bolt as it just goes into the stock to hold the trigger guard. I have seen these both phillips head and allen head.

You got a great deal as the going rate for a LA/ with bolt is around $225-$250. Nice find. I'm sure it shoots like a typical Savage.