Most of those "kits" use a combination of parts from U.S. and China. Mine had the same brand name with different country of origin. But, you can run into the same thing from NAPA or other suppliers unless you specify U.S. made parts only. Who really knows where Moog or other name brands have their parts sourced? I've gotten bearings from NAPA that were made in China.
It's 50/50 whether to buy piece meal from NAPA or a kit. The benfit of a kit is it's all there, no hunting or waiting. Usually it's cheaper to buy the kit but the country origin is not guaranteed that I'm aware of. All the resto houses and suspension companies sell kits.
I bought a front end kit with shocks, center link and bushings from: http://www.performancesuspension.com/
(Not to be confused with: http://www.p-s-t.com/
Both are often refered to as "performance suspension".)
The bushings and motor mounts were "Energy Suspension" bushings and motor mounts and the front end parts were mixed source, same brand. I could have bought the ES poly bushings and Mounts from Summit or JEGS for less. Since I bought the front end parts and KYB shocks too in their specially packaged and priced kit, the total price was about the same. I'd probably source my own parts next time.
Center links are about the same price from NPD or others. Buy it in combo with shocks or something else to save on shipping if NAPA doesn't have it. They couldn't supply a 67 center link. But can from 68 up.
Weren't you going to get your frame galvanized?