What engine and transmission could I fit into my 1987 porsche 924s?

Looking at replacing the engine and transmission of my 924S and hoping to upgrade in the process. I know that with a little modification a ls1 v8 will fit, but I'm hoping to stick with a powerful 4-cylinder and a manumatic transmission.|||A 924S engine and transmission. Why mess with a good thing? You want to put poorly engineered American iron in there? German engineering is one of the finest in the world. You can add a performance clutch, a K%26amp;N intake, maybe bigger injectors. Keep in mind, European cars are not designed/engineered to be blasting from 0-60 in no time, well the 930 turbo made the exception, they are designed to drive constantly at triple-digit speeds. Also, a tiptronic will take a lot of work, since its electronically controlled, get used to the third pedal, you will be happier.|||A small block Ford with aluminum heads and water pump is one to the smallest lightest motors made. With a stroker crank you can have up to 352 cid with a stock block. Above 600 hp and very streetable. Add a AODE with a aftermarket controller and tap up and tap down to shift. What more could you want?