1962 C10 Frame to 1978 front 1/2 ton suspension

[robber grin]

As the title implies I am interested in installing a 1978 1/2 ton Suburban front suspension clip to my 1962 C10.

Unless I misunderstood, I've recently read in another post on another board that there is a spacer required for the 62 frame to utilize the newer xmber due to a slight difference in widths???

I have seen detailed description on a 60's conversion and had been referring to it when I noticed a difference in the holes in the frame area (as pictured) where the cross member bolts up.

Are there specific issues for the 62 frame?

I measured with a tape measure an there does seem to be a slight difference in width... the 62 front end is already out and long gone so I measured bare frame rails.

Do I just jack it up into "the spot" and mark and drill / elongate the holes as required?

I'm waiting to hear from you guys that have been there before with the 62 C10 conversion.

ANY HELP IS APPRECIATED!
Bob