Congrats Patrick! I have linked a Photo Journal of my project that kinda gives you my process without too much reading (and shows off my handy work)... https://www.hotrodders.com/forum/jou...ge=1&reverse=1
I hope that is OK with the mods.
The decision to go concourse or resto-mod is for you and you alone. IMO, if the numbers of the car say it's something rare...consider maintaining it's value by keeping it original OR selling it for a good build price and buy the plain Jane model and go to town (that's what I started with - the most common mustang available in 67 - no hard feelings when it came to changing it up). If it's a pretty common OEM model, I wouldn't sweat the idea of doing whatever strikes your fancy.
At any rate, the journal starts on "the day she came home" and runs through near completion...they are never really done!
In short, my procedure was...
1.) Take it apart (take lots of pictures and always keep a roll of masking tape and a marker handy for tagging parts with notes, especially the wiring harness)
2.) work over the unibody (rust repair, add torque box and sub fram connectors).
3.) add suspension (it's a good day when the unibody rolls again, consider the Shelby Drop)
4.) pre-fit all the sheet metal and tweek where needed.
5.) Paint engine bay and under carriage.
6.) Install drive train (and just try to resist driving it down the street with no glass, fenders seats (seatbelts) bumpers, doors hood, mufflers, etc, etc - I couldn't resist!)
7.) Paint the car.
8.) Touch up engine bay and undercarriage without messing up exterior paint.
9.) Do the interior while adding the trim and chrome to the outside.
If you are anything like me...
10.) Blow motor up.
11.) Replace motor.
12.) Blow up tranny
13.) Rebuild tranny, Blow up tranny, Rebuild tranny, Blow up tranny, Rebuild tranny,Blow up tranny (it was a lemon AOD).
14.) Convert to 5 speed manual.
15.) Put miles on the car without working on it every month.
16.) New tires after 10K miles.
17.) Put more miles on it when the sun is shinning...smile!
Enjoy it if you can, muscle cars are not for everyone.
Edit: one thing I might do different...Remember.... A 289 is small, a modern 302 is not as small, stroking the motor helps, add computer controls to the mix and your getting there, but a stroked 351 in my 67 would have been better. Not sure how one would fit in a 65 so, remember...there is no replacement for displacement!