If you have a complete donor car then it wouldn't be too bad a job to do the conversion.
Still a lot of work in it though as you would basically have to transfer everything from the donor car to yours including engine + box (obviously!) front subframe and suspension, all the wiring and pedal box and all the rest of the bits for the hydraulic clutch. You'd also have to change the rear axles to match the wider track front from the VR6.
The engines don't give much trouble really, when you have the engine out I would get the head rebuilt and have a look at the bottom end, it will probably be ok with a set of rings, then rebuild the engine with new timing chains, tensioners and guide rails.
So basically there's nothing that difficult about it apart from the volume of work involved.
Still a lot of work in it though as you would basically have to transfer everything from the donor car to yours including engine + box (obviously!) front subframe and suspension, all the wiring and pedal box and all the rest of the bits for the hydraulic clutch. You'd also have to change the rear axles to match the wider track front from the VR6.
The engines don't give much trouble really, when you have the engine out I would get the head rebuilt and have a look at the bottom end, it will probably be ok with a set of rings, then rebuild the engine with new timing chains, tensioners and guide rails.
So basically there's nothing that difficult about it apart from the volume of work involved.