I’m thinking the Stock and Super Stock guys used the 440 crank because it was LIGHTER. Big name engine builders been using the 318 cast crank in the 340 cars for years because it’s lighter. Cast cranks in 383-440 also, about 8 pounds lighter. I would use the 440 crank so the balance is off a little, street car!
I weighed 4 cranks I had in my shop years ago. A steel 440, cast 440, a steel 383 and cast 400 and they were all 76 lbs, I was surprised. I used a cast 318 crank in a 340 NHRA stocker engine I built for a customer once, it was about 5 lbs lighter.
