I like FBBO....For B Bodies Only, FABO, For A Bodies Only....They both have a lot of traffic and move pretty fast. They also have FCBO and FEBO....Oh, and an FMJ forum.
For trucks, THIS site still seems to beat FTO For Trucks Only.
I have 2 Chargers so I'm on DodgeCharger.com and the 1970 ChargerRegistry.com
There is also the Road Runner nest. I've lurked but have not joined.
I am "Kern Dog" on the other forums.
Good luck to you, Greg