I think I'm running most of the decent 70s/80s AI, Ben. I must have at least 80 different model/paint combinations of that period at my retro airports. The best quality AI models are the AI Aardvark ones that are included in WoAI. If you check your WoAI collection you should find a 737-200, 727-100/-200, 747-200s (with different engine and freighter variations), DC-9s and DC-10-10/30. Any you don't have you can download from the Aardvark website.
http://www.ai-aardvark.com/ But most of the links there to decent paints are dead. So you have to then search for suitable repaints on Avsim/all nodes and put them in the relevant WoAI folder.
ALL of DM's models can be converted to AI using the batch file in the model folder and I'm using Rick's Vanguard and Viscount full models as AI with no frame rate hit. Dee Waldron does quite nice Convairs, DC-8s and Tristars but the 707's not too hot.
http://htaimodels.com/downloads/dwai/fs_projects/
I've had to resort to using a modified HJG 707 that Peter made available, but it does slow things down on my PC, so I've used it sparingly! Dee Waldron's models are used in the CalClassics collection but most of the paints are too early for you (60s).
Let me know if you're looking for anything in particular because I probably already have it!
Ian