Gm Part # 12353944 is stamped on a aluminum 2"x2" tag riveted to the block with all of the displacements. K-18 445 Hi Per. Pass is on the transmission drivers side mounting tabs of block. 0063286 is in the center of the trans tab on the block next to it is GM 3P and on right side is KO 82. I also Have (Hi Perf) stamped on the block behind the flywheel . Can you help me identify this motor ? Yr ? Make ? It is a 454 BB with oval port heads and angle plugs.