Is there any way that I can convert my Lincoln LS so that it will use E85

NO. The alcohol is very damaging to normal fuel components. You would have to have stainless steel tank, lines, & special fittings. That was the easy part..now u need new special injectors as this fuel only have 75% of the energy of gasoline so u will lose around 25% of ur gas mileage & save only !5% on cost. Oh, yes, u need a new computer & associated parts to handle this fuel.
Did not mean to burst ur idea,,but really not practical or necessary. Even if u could do this & yes, with enough money we can do anything,,could u justify the cost?

NO not yet but you can bet you sweet feet there will be down the road somewhere They won,t us off of the oil that we are using.