Driveshafts

Hi guys, I have a 69 Dart 727 with 83/4 I wanted to upgrade to a better yolk heavier duty and was wondering what is the best donor car /truck I could take a driveshaft out and have it cut down??? Junkyard build

Thank you, Mopar or no car

The car just got a narrowed rear end moved the leaf springs in moved back the leaf springs a half inch

Depending on what's in the local yards I would say 60-70's trucks and possibly land yachts