I didn't know if I wanted to step into this one or not! I have a question. How much did you know about a '68 K1500 when you decided to go about this restoration? Ok. Well, you're learnin'
. That too is what this restoration thing is all about. It ain't no kit
The spring width on 4wds changed to narrower after '68. '69 has the same drivetrain and was last year for V6. Steering changed in '70 as well as new transmissions and transfer case came out. Basically, drivetrain changed except rear. Then disc brakes on same front end in '71. A lot of people go with swapping to later components for convenience, parts availability, serviceability, upgrading. Restoring to original is never the easiest route. You take a direction and keep going until it's done. Maybe move to another thing when something gets frustrating. You'll get it done.