If you want to completely destroy the bank, here is the V8 for you.
http://www.h1v8.com/page/page/1821906.htm
and if even more is needed Holeshot racing does a twin turbo
http://www.holeshot-racing.co.uk/index.php?page=holeshot-hartley-v8
If you want to build your own I understand but it is possible to save buying a "completed" (they never are done) car. The USA 7s board is a great resource.
Ed