Point me to parts & rebuild kits etc.? '66 Signet /6

Suspension wise, I would call ESPO. That's where I bought the parts for my 65. They made me a good deal on OEM type parts in a mix-match kit (11/16 tie rod ends/sleeves, larger ball joints). My plans are for a nice handling, smooth riding street driver. Here's the pile of parts I have so far: .870 T-bars, repro HD leaf springs, Addco sway bars, and Bilstein shocks. I also rebuilt a manual box with a 20:1 worm/nut. The Addco sway bar mounting leaves a little to be desired, but nothing that can't be taken care of with a welder.

Brakes wise, don't even think about keeping the 9" drums. They were "weak/fadey" when new, and that's being kind. The 65-72 K-H small bolt disk setup would be a great upgrade. Upgrade the master cylinder and plumbing to 68-up dual circuit while your at it (important).