I can't believe how much ass you people kick. When I mention this idea to most people, they think I'm looney tunes. You are all very supportive and you're all getting me geared up to do this.
As for the rear, I have an 8 1/4 Mopar posi out of a cop car. I have the same rear behind a 410 HP smallblock in my Volare wagon drag car, and it has held up beautifully.
Dave, I think I'll follow your advice. I found a few 240Ds here and there, they seem to be plentiful enough. I'm hoping to inch close to 40mpg, I'm hoping the weight will be a huge factor in this.