Ever stumble on a good deal for a used part

My dad was at a friend's house and he had 440 blocks laying around. My dad pointed at one block and said how much his friend said you can have that block for like 40 bucks. My dad took it to the machine shop to get the block bored and the shop guy called him back the block had a set of closed chamber heads attached. Dad still has them to this day and runs them on his 440.