892 and 893 torsion from original 340 car???

Quick question, a bud has a set of 892 and 893 torsion bars he got in a trade that were supposed to be from a 340 car. If they aren't from a 340 car will they work well in my 70 Dart with a 360 Magnum? I'm not looking for the biggest ones I can get just an adequate upgrade from the original /6 bars.

They'll only add 10-20 lbs of spring rate depending on whether your slant six had A/C or not.

Unless they're free, I'd hold out for a set of much thicker bars.