Does the numbers stamped on the piston tops mean that the cylinders have been bored? I cannot find what that suffix code is. I have never seen one stamped FBH. Could this be a crate engine from Tonawanda?

I recently purchased a chevy 454. I have cleaned it up and found every number on the block but having a hard time decoding them. Front Center above timing cover T0928FBH Tonawanda, Ny - Sept. 28 Cannot figure out what the FBH means Front Passenger beneath cylinder head...