80/20 Rule

I'm new to this. I started my first rebuild almost a year ago, and I was very intentionally wanting to spend 20% (or less) effort just to get it back on the road as soon as possible. I foolishly thought it might take a month if I took my time. Then I started thinking about performance, and the whole "well, while the engine is out, I might as well do X and Y and Z." So after consulting the brain trust here, I've learned volumes of how things work in my car and I've slowed my roll. I realize it's not a race to get it done, it's more important to get it done RIGHT. Sometimes I pop the hood and don't even work on it, I just look things over to make sure I'm not forgetting anything.

So after a year of pissing off my HOA with a non-running car in my driveway, I'm thinking I might have the 80/20 deal backwards...80% effort with 20% of the performance potential realized...
My rule of thumb is this while you can have that 'one' motor ...you should always have two or three motors. One that will run ...and another your building to the height of your horsepower dreams. Always have a back up...