Hi PD,
Those rifles, if they are in the silhouette stock, sold for around $550 to $600 new at the time. I don't believe they were selling the 54 with a factory bloop tube at the time so the tubes you have were probably put on afterwards. Nothing wrong with that. Placed into a hunter rifle stock, the action is legal for both classes. In the factory silhouette stock it is legal for standard rifle only. Another guess about those two rifles is that they are both single shots... If they are repeaters, hunt the guy down, hit him over the head with a blunt object and shove the money in his pocket.
If they are not, and this is strictly a matter of personal preference, I would pass. I would rather have a magazine fed action. For $1000 each I would rather spend the extra money and go buy a new 54.18 MS repeater in a thumbhole stock.
if you decide to go with these two rifles and they are single shots... assuming they are in silhouette ready stocks... i wouldn't pay more than $1500 for both of them. He will get the pleasure of owning and shooting two very nice rifles for about 2 decades and get all of his money back and more... you will get the honor of owning two very nice rifles at a reasonable price. sounds like a win/win to me.
You don't both need your own rifle but for the sake of your marriage i would certainly make sure you do. That way when you screw up your sight settings your wife won't want to kill you because you ruined her score. also, your fit may be quite different than your wife's. And... most importantly, it allows you an excuse, a weak one but any excuse is better than none... when she starts beating you you can claim she got the better of the two rifles.
dave imas