How important are track bars?

[Angrywood]

Just a little backstory. I got what i thought was a 1962 C10 Fleetside. I come to find out the previous owner swapped the rear axle/differential and i believe possibly part of the frame with a 74 suburb. I just finished putting in 4” drop coils and shocks. Went today and had kind of a hard time putting the track bar in. One end bolts to the frame up by the rear driver side. Other end bolts to the right or passenger side of the differential. Measurements now are 7” driver side 6.5” passenger.

Question — how even do i need this to be? I can not twist the bar while installed to adjust. And i think to take it off and adjust it and try to put it back on will be a real pain if at all possible. I have the bed of the truck off right now and want to get it as close to center as possible before i put the bed back on.

Thoughts? Thank you