That's a much better sway bar to K-frame setup than what comes with a Addco kit. Much like the Energy conversion adapters for 67-72 A-bodies (Mabye early A's too?).
If you made you sway bar end links any longer would the interfere with the front mounted calipers?
Is the Addco sway bar end link holes the same distance apart as a stock 64-66 A-body sway bar?
You have the end links going to the shock bolt. Are the end links tugged inward somewhat? The factory sway bars mount further out.