Whats better the 351 ford Windsor or the Cleveland and which has more hp and more higher rpm's?

The 351 Cleveland was a performance motor and came stock with more horse power . As far as RPM 's , really not a lot different . 351C does have a better low end . If you are thinking about swapping them , you need to know that the only similarity with the two is the cubic inches . Only thing that will swap is the carb and fan .