My personal opinion...

I wouldnt run a cossie or even a turbo lump in something like a westfield... purely because the way a YB delivers the power is with a massive surge as the turbo kicks in. I would go for something like a E36 M3 Evo engine or maybe a E46 M3 engine and have something with plenty of grunt but also a very nice smooth power delivery. Will make the car a much better drive and I bet quick around a track