I am showing my age here, but the Mk4 Cortina (and Mk3 IIRC) had a similar void bush arrangement, but on the rear axle.
That was a crap job to do too.
Anyway, I learned the hard way to torque them up with the axle loaded. The first set I did were torqued up in the air. That applied sufficient twist to the rubber that they were destroyed in 3 months.
So don't assume your rear beam bushes survived.
If you need to re-do them, consider polybushes. They will self align in this scenario.