Auto trans input shaft/TC hub vs crankshaft register

I once bolted a 65 tranny/TC onto a 68 340, and dropped them into a 65V-100 wagon. I didn't know anything about the register/pilot error. I was in my early 20s, I was just a dumb kid.
I drove the berrys off that combo and never noticed a thing. A couple of years later I sold the roller and moved on; I kept the engine and tranny.
I'm not saying that you should try it. I'm only saying that I got away with it.