Jim Carter's website is oldchevytrucks.com. The kit part number is HP524, I believe.

Most 1/2 ton conversion kits have a dropped spindle that I don't care for. It would be fine for a truck that I planned to drop, but when I did my 1/2 ton it was on my work truck - so I just did it using later stock pieces (on a 66). If you have an IFS truck I'm sure you could do it that way too.