Brake drums

Did any dusters or darts from 73 and up have front drums?

Yes, but they had the 5x4" pattern. The spindles were different, they used larger wheel bearings than the 67-72 drums, and they used the larger ball joint UCA's just like the 73+ disks. But the drums were still SBP. 73+ disk cars were BBP, 4 wheel drum cars were SBP.