At a Crossroad...again. If I had only known!!!

If it was me I'd break it down into smaller projects.
Write down some general headings. An outline form works well. For instance, suspension. Then break it down further into front and rear. And then more entries under those.
Brakes, engine, transmission, rear end, interior, body and paint, etc. Break those down into smaller tasks, finish them one by one, cross it off your list and then onto the next.

Schedule definitive times to work on the car. Something like every Tuesdsy and Thursday from 8am to 5 pm. Don't forget a short afternoon nap. This is your new part time job!!!

The hard thing for me is just getting started but once I'm into it, I get lost in concentration. Also, it helps to have a buddy show up and help out occasionally. Good moral support if nothing else.

Come to grips with what you want your car to be. Is it really necessary to completely rebuild and blueprint the engine? Or would you rather be actually driving the car with a re-ring, hone, bearings, paint etc. Giant carbs and big cams mean nothing if the engine is still on the stand and the hulk is still in the garage. 10 mpg or 15 mpg? If you already have the headers use them, or not, or sell them and use the money on something else.
When I have the money I don't have the time. When I have the time I don't have the money. Shrugs.

Get started, get organized, knock off a few things and you'll get motivated.
I always say, when building a brick house, there is always a first brick that gets placed, then thousands more one at a time. Then you're sitting inside in your rocking chair.