Check out this awesome build thread by Vorshlag over at bimmerforums. They enter the GRM $2010 car challenge. They can only spend $2010 for the entire project and compete against others. They convert a BMW 325 they bought off craigslist for $500 to an LS motor from a Chevy truck. The amount of work these guys put into this build is incredible. Follow their progress! Well worth reading every page.
Vorshlag $2010 GRM Car Bimmerforums Thread
And here's the first vid of the car running with its new heart transplant.