Correct me if I'm wrong....
You have 3 cars: SHO, SVT, contour, 2 of which are running and driving.
My advice, sell the SHO or contour. Use cash from sale to fund getting the SVT running and driving, in the mean time (1-2 months as stated) drive the contour for daily purposes.
When SVT is satisfactory, sell contour.
Seems like a no brainer to me.