Dead stock bottom end quickness

On a dead stock 318 bottom end I went 12.54............

OOPS....my bad, here we go....

In reality the engine is a junk yard, jig-saw build...

1980 standard bore block, crank from 71 318 from D600 truck, 273 rods cast pistons, angle milled 360 heads with 2.02, 1.6 valves, Comp Cams XTQ281S-6 cam, Eddy TorquerII intake, Holley DP750, Thorley 'D'-Dart headers, in 65 Barracuda, 4500 rpm stall vert, 904, 4.88 gears