[THEFERMANATOR]

I would seriously consider a replacement 3.7l if it was mine. There are companies out there rebuilding them. And if everything is updated, they're not bad engines. They make similiar power to a 4.3l v6, weigh a good bit less, not bad on fuel, and I always thought they were a perfect fit for a V20. Otherwise your looking at a 4.3l engine, and most likely having to redo your engine bed as the 4.3l mounts in considerably different than the 3.7l. You could also consider a 3.0l, but then you will most likely need to regear your outdrive, still have to do quite a bit of work for the engine bed, and be borderline underpowered when its all said and done.