recently, my '87 4Runner had broken the timing chain. i originally thought it was a fuel pump, but later learned since the engine had no compression, it's a broken timing chain. i have a lead on a 22r engine from an '83 or '84. i was told by the owner that it wouldn't be able to be dropped in, due to different mounting positions. here's my question: can i use the parts from the replacement engine(mostly top end: head, valves, pistons, etc.), and will they bolt into my engine, along with whatever gets fixed? i need answers, as this is my DD, and i desperately need my truck to be running back to normal.