The Windsor was the everyday workhorse engine. The Cleveland was the high performance engine. Much sought after. Funny thing was, the Cleveland wound up in some more family type cars like the Montego. This made them real sleepers and later made those cars sought after by folks who wanted a Cleveland engine for for other car. Buy the car, jerk the engine and then scrap the car. And the rule with the hot car crowd was "where a 302 goes, a 351 will follow". As I recall, a mild blueprint and build on a Cleveland would make 441 hp. On pump gas.