70 GMC steering questions

[71K1500]

Hi guys.
Dont usually post but have questions about my kids 70 1/2 ton.
Its a dailly driver and the steering makes me crazy. It wont return to centre. The box and drag link ends have been replaced. New tires, wheel bearings etc. Had dlignment done. All looks good.
We replaced the box to remove the slop. The new box is nice and tight.Almost too tight. Im beginning to wonder if it wasnt set correctly after the rebuuld.
Also, should the drag link be parallel to the ground or is a slight angle ok? The suspension seems to be a bit higher than stock. 4 leaves on the front. Im going from memory from when I had a 72 GMC and seem to remember the front having 2 or 3 leaves and a slight upward or negative arch. His have a bit of positive arch.
Sorry for the long post but Im starting to pull out what little hair I habe ha ha.
Any suggestions on what else to check?
Thanks
Jeff