BMW 325 Engine

[mark]

If you make it longer and wider you will have to make all the bodywork to suit and cut and shut nosecone /scuttle etc

If it was me i would try very hard to leave it standard dimensions so you can fit saturn bodywork without having to try and chop it up to get it to fit

Im suprised it wont fit in a standard chassis as there is lots of room in the engine bay, saying that i have had a few bmw"s and the 6 cyl engines are pretty hefty.