Just got this '73 454 motor. Pulled the heads off. Its standard bore with hardly any ridge. Looks like someone had replaced rings and bearings before, and replaced one piston. Now, isnt the mis-matched piston a flat-top? and the others are dished... so, this can't be good to run, can it? I dont think the two larger valve reliefs are enough on the flat-top to compensate for the dish in the others.