A neighbor just gave me two old single barrel Rochester B carbs that he had laying around his garage. They are still in the box and appear to be in great shape. Can these two carbs be used in a dual carb set up for my engine ??? (59 trck original 325)

I see a lot of guys running dual carbs with split exhaust. Could I use these carbs as a starting point or is there a better carb option. (I don't have a lot of $$$ so anytime I get free stuff I would prefer to use it). Are he Rochesters what most people use?

Also, I have a local guy that says he can split my stock exhaust manifold for me. Is this recommended? Is there a reason why I should buy Fentons or some of the other name brand? Are they better than splitting my stock exhaust?