Hey Pony Power.
Lets see, there are many diffrences between a 64 Fairlane, and a 64 Fairlane Thunderbolt.
In 64 the Fairlane was based on a smaller chassis than previous models. It is roughly a similar size as a First Gen Mustang. 65 is about the same size. I believe that in 66 they restyled the Fairlane completely, and it grew drastically in size.
Normal production 64-65 Fairlanes accomidated Small block Windsor V8's rather nicley, but as for room to shoe horn a FE 427, it would look impossible.
I dont know who ford sent those 100 Fairlanes (That were destined to become Thunder Bolts) too. I wanna say it was the same people who did the work for the Boss 429.
As to what all it was that was changed from a standard 64 fairlane to a Thunderbolt, I dont know. I know the shock towers were heavily moddified and reinforced, and I know there were light weight fenders, bumpers, and of course the symbolic Tear drop hood. The two inner head lights were taken out and used for opening to gulp in coupouis amounts of air. They were also given light wieght glass. If I remember correctly, all were sold with Auto's. It was a moddified version of the auto tranny Ford and Lincoln put behind there 430 ci engine. As to what the model number is I dont know.
All of my books and materials are in North Carolina, and at the Moment, I'm in Pittsburgh PA. A few years back I would be able to tell you about everything you wanted to know, but with all teh crap that floats through my head (theres alot of it

) Its hard to keep track.
My friend has a 67 Fairlane, a 66 was just about identical in styling. I think a 66-67 with a REAL STOUT FE BB, a 427 Fairlane hood (Huge Scoop in front), or a Tear drop hood would look sweet.
I think it should wear period/era wheels to keep that classic Muscle look.
Those cars tip the scales at 3500 Lbs with a Small block and a Auto tranny.
RED in book is a must

Is there any other color???? your ideas sound like a good start to a mean project car. I especially like the Two door Post.....Plane Jain Muscle Machine. Gotta love it.