Great job rounding up parts and on assembly! You are correct if you started off with the timing dots lined up then it won't mater if the engine turns as the timing chain keeps the timing gears relationship correct for the camshaft and crankshaft. To prove it to yourself turn engine through two compleate revolutions from TDC or until you come back to TDC from were the engine is now. TDC this is where the crankshaft key way is pointing straight at the center of the cam gear and with the cam gears dot will then be pointing to the dot on the crankshaft gear. Once you get it all back togeather with the new timing chan set and rebuilt rocker arms if you wanted to you could do anther compression test to see how much those new parts may have changed it. I am betting the timing chain gears will make a good difference plus the rocker arms should make it run a little smother and quieter. Keep it up