[JThiessen]

First - I'm really interested in seeing what you end up determining a "fair amount" of your RC's is!!!!

I would almost give the nod to the Lincoln chassis. The Sentra chassis MAY not be able to handle the weight of the batteries, and the suspension might also suffer - but thats hard to determine right now.

Second, it sounds like you are looking at RWD - which also points towards the Lincoln.

Narrowing a rear end is EASY...dont spend much time worrying about that. You may even be able to find one out of a drag car or even a stock car. Advantage to that they are often set up with quick change gears, which will make it easy for you to change gearing if need be.