For the OP, if he is still here, just be advised that using the KB167 pistons will typically require a re-balance of the crank to match the lighter piston weights. There looks to be a trick to avoid this with your earlier crank and rods; let me know if interested.
Yeah bottom end balance is something I plan to have done on this engine, and all this is definitely a lot but I read it all and I’m just tryna learn what I can.