Connecting Rods needed for try his crank

You should get that crank cleaned up and checked before you put money into it.
What do the heads and block look like?
Do you know the current bore diameter?
Yes I am going to be sending all three parts to my local machine shop before I start my rebuild. As for the block as long as it is not cracked or compromised in anyway I will rebuild it even if it needs new sleeves. Also if heads are in good enough condition for a rebuild, I may still just go with some aftermarket aluminum heads, I will figure out the cost of rebuilding vs aluminum heads. If crank is no good what options do I have for a 340? Here's to hoping everything is decent enough to keep, and get f all of s good what con rods and type of balancer should I be looking for?