As seen just two weekends ago at Snetterton!
(http://www.britishracecar.com/ShaunHolmes-MG-MGCGT/ShaunHolmes-MG-MGCGT-AF.jpg)
Shaun races in a series that allows some pretty cool mods. For example, he has recently improved his MGC by upgrading from troublesome triple Webers to EFI (and electronic ignition). The rolling road showed a benefit of about 47 brake horsepower, plus Shaun feels his car's driveability and reliability were substantially improved.
Here's a link to the full article: <a href="http://www.britishracecar.com/ShaunHolmes-MG-MGCGT.htm">
Shaun Holmes' 1969 MGC-GT Vintage Racecar</a>