if you looking for a big engine,if i ware you, buy an old BMW 750 i V12 with an qearebox of Audi A6 V6 2.5l,you can get an adapterplate at paralleldesing for audi to BMW.
you can buy there the wireloom for these engine's.
i buy my wheels and rims at image wheels for the lambo's for the price of around £2500 !!