Even with all that, a 60mm will be closer to your goals. It will still fall flat on it's face at WOT with a 65 for 75% of the throttle opening,unless you are spinning over 7000 RPM all the time.
Out of all those mods listed, the only ones that will make a difference in TB selection are the cams, IM, slight porting,and header. Nothing else really matters, other than the gearing, which will help a little with too much throttle bogging.
The difference that 5mm makes is night and day for driveabilty. You will be slower, due to having to back off the throttle to start pulling. Your foot is not quick enough to make all the little adjustments to keep the velocity and manifold pressure making magic. If it was an e throttle, (PCM controlled) you might actually gain form a 65mm.
But to answer your question anyways, to use the Ford Mustang/Thunderbird/Pick up TB, it depends on how the inlet of your AAM manifold is configured. If it is set up for the slip on coupler that 2gns use, you will have to either modify the IM for a flange, or make a flange to couple to the IM.
If it is for a 1gn style, you could just change the flange/make an adapter. The TB will need the cable end modified to bolt on a neon cable pulley.
This was made for a 2gn style IM:
If you want to use the neon TPS, you need to get creative.
I have a "How To" on 2gn.org for adapting the TPS. In most cases the Ford TPS will work, but you need to cut and splice wires. I did this mainly because the Ford TPS I had was too high on the voltage. The throttle was more like a hysterical child/on-off switch.
This is my current evolving version:
The purple fuel rail was so I could easily distinguish it from the other as it has 24 lb injectors for E85...