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

The motor mounts you want, if you never want to have to think about them again, are here.

Buy Koni or Billstein shocks for the same reason.

Carburetor air cleaner bail is going to be a "go fish" used item; you need to specify whether you have the small (~9") or the large (~11") diameter air cleaner.

If it's time for a brake job, it's a great time to think about a brake upgrade; 4-wheel drums, particularly the A-body basic-equipment 9" items, are marginal at best when in perfect condition. Not worth putting money into them; get discs or at least(!) 10" drums.

The urethane vs. rubber front end bushing debate won't be ending any time soon; you're on your own to decide what your priorities are, but if you're still mousing around with 9" drum brakes at all four corners, you've got a long list of things to upgrade before poly bushings even start to be worth discussing.

I tend to buy my front-end parts and kits from ESPO.

Tune-up parts and technique suggestions in this thread. Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download. Also check the Fuel line mod and HEI upgrade . See here for other parts sources.