Let me make it clear I know the E58 is super rare. I'm keeping the heads carbs and intake and will shelve them on rebuild I won't do anything that makes the block unable to be returned to stock. If the block is even good it does have low miles well have to see how it machines up for lower end which will be little better set of pistons better compression. Trick flo heads and intake cam should be good for a nice 420 plus hp I have read. Main thing I have to do start buying parts or I won't do it. I could do the stock heads 2.0 valves better piston maybe get close to that number. My issue is I don't want to ruin a block and a low production numbers car.