I've done my share of dumb things with cars over the years, including putting the jack through a tail light when the car rolled forward because I didn't block the front wheels. Most recently when I was assembling a 360 for my 75 Dart Sport I installed the new timing chain incorrectly. I was thinking small block Ford alignment, (had just done one a few months earlier), instead of small block Mopar. Surprisingly the engine did run, not very well, but it did run.
I went through the distributor alignment multiple times, rechecked the firing order multiple times, changed the carburetor and fuel pump, replaced the distributor and ignition module, coil, pickup, cap, rotor, etc. multiple times, even swapped out the torque convertor, refusing to believe that I fucked up the timing chain alignment. Finally after about 2 months of frustration with this engine I finally pulled the front cover. Yep, I had installed the chain wrong.

It ran much better after I corrected it, but never had the power that I expected when compared to my previous 360 Dart.