I have never read of someone putting a 67+ K-member in a 63-66 car. I hope you know that 67+ cars are wider. Even if you drill holes to bolt it up, I suspect you would have many problems with the steering linkages, plus the suspension probably wouldn't work since the T-bar holes would be too far out, as would the lower ball joint, spindle would then be leaning in, tires would hit the fenders, ....