The "XU" stamping indicates that this particular engine is a 350 H.O. from a '69 A-body. Featuring large-valve No. 48 cylinder heads, a No. 067 camshaft, and a four-barrel carburetor, the 350 H.O. was a respectable performer, rated at 330hp that model year. The fact that only 2,800 XU-code engines were assembled is reason enough to attempt to salvage this LeMans' original block during its restoration.