IMO the Cleveland would be the WORST choice for an engine. Yes, back in the day the Cleveland was (and still is) a high performing engine, but today you can get a great performing windsor that fits in the bay. I have some Tubular Automotive headers for a 351w in a '64 Falcon, but if my five bolt 289 ever dies I will likely rebuild the 289 HiPo block I have into a 331 or 347 and keep the engine as compact as possible.