my 340..3 cars, 34 years, 1 family. where to go from here

I discovered the cam is a crane cam, a 284 h12 that crane lists the "operating range" as 3,000-6,200 rpms. I dunno, I think that is a very poor operating range for a street car in my opinion this contributed to the poor performance. What do you guys think of this cam, as i am far from an expert. Also I found 2 cylinders with condensation in them, one not too bad, one not good. You can see from the cylinder head picture the price of condensation. Can anyone tell me what part number im looking for on the pistons to get more info from them? I assume the block and heads have to be gone through now? Opinions? thoughts?