Rear Axle Assembly swap - trackbar mount

[53lowdown]

62 C10 with Eaton. Swapping in an Axle assembly from a 96 Camaro this weekend.
I need to swap the track bar mount onto the new axle. Wondering how others have done that so that it ends up being in right location?

Do I install the axle, center it, and then weld the bracket on? I don't like to weld upside-down and backwards.

OR, do I need to create some kind of jig to hold it in the correct place and weld it on prior to install? Would like to do it this way, but can't picture how to create the jig