Dumb Mopar moves - this should be fun

Curious what do-overs you all would like to be given. My #1 was when a bought a 70 Challenger "parts car" in the early nineties for $500 and sold it for $250 to a kid that was going to use it as a BOMBER CLASS STOCK CAR!. Still makes me sick to think about. All I took from it were the Rallye wheels, 8 3/4 rear, back seat, and front bumper to use on my dad's car. 383 2 barrel car that, looking back, was still a a fairly straight solid car. I just couldn't have a second car at 18 years old. #2 was when the original 273 in my 67 Belvedere ate the mains, I sent the entire engine to the junkyard. Didn't even keep the probably forged crank or the adjustable rockers. I just didn't know better at the time. #3 was the 85 Diplomat police car that I bought for $100 solely for the 4 barrel intake and 360 heads. The 318 still ran well and I wonder now if it may have been a roller motor. I didn't even know enough at the time to look when I pulled the intake and heads. The trans was bad and, once again, I sent the rest of the car to the junkyard. I'd love to have that whole car back now. It was pretty solid.