Are you a US citizen?
If not you're not buying into either company.
GM & Ford are both US owned corporations, they are also haemorrhaging cash at an alarming rate. GM is losing $1bn a month and Ford is losing about $600mn a month. If this continues GM will run out of money by about June 09 & Ford will follow about 6 months later.
No government would allow a company of this size go belly up, job loses would be in the millions...