Wheel Fitment and SBP – to – BBP, Lessons Learned (1969 Dart)

Just my. 02. The adapters are completely safe an would be safe In a much higher load application as well. They original studs are fully engaged and the rest of the adapter is plenty strong. Jeep guys run this type of adapter with 35 inch tires and the wheel adapter is not the week link. These are not the same old spacers we used to cram between rim and the hub.
Your wheel selection looks good. I would be concerned with the tight clearance. If it does become an issue I have had a machine shop redrill my axles and drums with no ill effects. just redrill them and haw them press in new studs. You could probably resell the adapters on here with out too much problems