What are cons of a 351 cleveland motor in a 1981 Mustang?
The Cleveland had better flowing heads then the Windsor, but a weak lube system that made the bottom end of the block unreliable. The W, on the other hand, had a solid oiling system/bottom end, but low flow heads. When Trick Flo came out with the first aftermarket heads for the W, they cured the low flow problem, and pretty much nailed the coffin shut on the C. That's why the big C is now history..... So, if you want to put $$ into your C, that's up to you ........