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    1978 Trans Am - Help Needed

    I recently bought a 1978 T/A sport coupe. Originally, it came with the 6.6l 400. I was tearing it down for a rebuild but ran into some issues. The engine is not a 400. Heads are 4X, with a secondary stamp of 1H, and the front edge has #206318 YY. Ang G203 Block: #485428 So if I am...