60s is just like every other mystery game. If you get a good card, he's a keeper. In general, though, you should expect fewer runs scored, which favors both good fielding (there's not a lot of it compared to the other games so take a good glove when you can find one) and big hitters (a rare breed compared to the other games). I would hang onto both of those guys.
While I haven't played a ton of leagues, the most consistent 3B is Eddie Mathews. I have had some success with Ron Santo as well. And Killebrew is a perennial first-round pick. Boyer (I am assuming it's Ken, not Clete) has just one stinker. The rest of his cards are really strong for the 60's set-- and he's super durable. You are not gonna see a whole lot of .900 OPS in this game.
While Reggie (I am assuming Jackson) is a little overpriced, he's not if you get the 69 card! Plus, there are more corner OF alternatives out on the wire as the season progresses.
I have played in enough leagues with you...you will figure all this out very quickly!