" From 1967 until 1973, the Mustang got bigger but not necessarily more powerful."Something about 1967-1973 modal. Ford's designers began drawing up a larger versions even as the original was achieving sales success, and while Iacocca later complained about the Mustang's growth, he did oversee the 1967 redesign. From 1967 until 1973, the Mustang got bigger but not necessarily more powerful. The revised Mustang retained the original body structure but styling was refreshed, giving the Mustang a more massive look overall.
I'm calling BS on this
So you don't think adding a 428 CJ, 429 CJ, BOSS 351 or any 351 4V
made the cars more powerful that a 289?