Maybe I've learned a good lesson . . .

I think defining a set of goals for the car will be the best thing for you to do. Define the goals, and build to suit. If you want 450lb/ft for example, starting with a 318 probably isn’t the best idea. If 20 mpg is the goal, your transmission choices and rear gear will change. So what do you want to end up with?

Edited to add; can we see a pic of the charger and the D100?