Basically, if you have an engine bored 0.030 over, it's going to be 0.030 of an inch bigger. Here is the stock spec for a 2.3, in terms of piston bore (how big the piston is, across the diameter):
2.3L stock piston bore: 3.7795 to 3.7831 in.
So, a 0.030 over-bore will equal:
3.7895 to 3.8131 in.
Also, I would research how any 4-cycle engine works, and what parts go where. Starting with the block, these parts are included in the block, and are considered to be "internals":
Pistons, piston rings (2 oil rings, 1 compression ring), wrist pin, connecting rod, main bearings, bearing caps, crankshaft.
Some parts are obvious, such as pistons and the crankshaft. Other parts, like main bearings, bearing caps, and wrist pins, are not. Wrist pins connect the piston to the connecting rod; it's called a wrist pin because while the piston moves up and down, the connecting rod has to move, using similar movement to the human wrist. The connecting rod connects the piston to the crankshaft. The main bearings, located inside the bearing journals (specially made, low-tolerance surfaces machined into the inside surfaces of the connecting rod and main bearing cap), allow the connecting rod to rotate around the crankshaft without breaking, using motor oil as a lubricant/heat sink. The bearing cap bolts into the connecting rod, around the crankshaft; most connecting rods are 2-bolt, some are 4-bolt, and some exotics are 6-bolt. Hence, this is why you'll hear the term that GM, back in the late '60s & early '70s made a "4-bolt main." They are referring to the number of bolts per bearing cap/connecting rod in a GM engine.
In terms of your kit, if you get those pistons, they should come with the connecting rods and wrist pins. An automotive machine shop should actually assemble them for you; installing them into your block isn't hard, as long as the block is clean and have the proper tools.
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