KB191's In A Stock Motor

Yes. The 191's look to be much higher compression ratio than 9.5:1..... like over 10.5:1 with stock heads and thicker head gaskets like standard Felpro's. And I don't have my notes before me, but IIRC you'd would have to rebalance with any of the KB's due to the lighter piston and pin weights.

If you are looking to go on the cheap, then consider H405CP's and a thin head gasket. Not a great SCR though... Consider the H116CP's if you want more.