Putting in the KB167's will drop bobweight by around 90 grams.... balance with be quite far off of stock.... no dice roll necessary as the answer is known. The only simple way to get back towards balance is to find a good used set of 273 piston pins (205-210 grams each) and put those in with the KB's' they are about 75 grams heavier than the 132 gram KB pins and will put the balance back close to stock. Otherwise, you can use a nominal bobweight number on the heavy 318 rods with the KB's and use that to re-balance the crank only (cuts balance cost by more than half), and you will be pretty close on balance (as good or better than factory). I have the data if you want to go down that road; ask here or PM me.
BTW, if you have 4 small eyebrows on your stock-replacement pistons, then those are around 3 cc's, not 6.
You did quite well with that combination to get those cylinder pressures with those pistons. Good work.
