I was digging through my garage looking to see what I had laying around to build a motor with and I dug up a 360 block I had that is bored .040 and its been align bored and square decked and new cam bearings and freeze plugs are installed. I found a new set of small block rods and a set of Kieth Black 107 pistons to put in it. Stock 360 crank cleaned up standard. I slid one piston and rod in and checked the deck and it will be zero decked when assembled. My question is with the KB 107 pistons that have a weight of 524 grams for piston and 132 for the pin require a re-balance before I assemble it? I looked up a stock 360 piston weight and it said 584 grams and I'm assuming that includes the pin. Getting a motor balanced around here is like pulling teeth, last time I took one to the machine shop I ended up going back 2 and a half years later and picking it up with nothing done. I'd like to have this motor running before April. Any thoughts?