Torsion bar numbers?

Embracetomorrow

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I just pulled the torsion bars out of my 1968 Charger 383 car, and the numbers on the ends are 417 and 447. Can anyone tell me if these are correct numbers for this car? And should I upgrade them if I’m going with a 440?
 

pnora

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The 69 383 Charger I took apart had 778 and 789
 
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