don,t know if its worth considering but i used to have a Fiesta with the 1.25 zetec engine & that was one nippy little car, very good on fuel too, tho if fitting to a Roadster then you,d need the cat too, but it was a nice little revvy engine, cheap on fuel & insurance, hmmm
, in a very light weight "7" it might be reasonably quick enough
andy
tho its not rear wheel drive but maybe something can be done to facilitate it, was just trying to express what a good engine it is for its size/weight.