cast crank to forged in 440

Another thing to check (if you're not acquainted with the flange distance on sight) is whether the eight holes are threaded or smooth. The old 413 cranks for the cast-iron Torqueflites weren't threaded (the studs were on the converter and stuck through the crank flange).

I fell for this one, many years ago... and tried for years to sell it to someone who wanted it for the correct application. Never found a buyer and finally scrapped it. Too bad, it was a nice beefy crank too.