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The article from the link you provided answers your question. Here "The 427 equiped Cougar was nose heavy and thus suffered in acceleration runs. To keep insurance agents happy, the 428 was rated at 335 bhp, although most experts believed it was closer to the same 390 bhp as the 427-E. The longer stroke 428 engine had an easier time with emission requirements and would carry the Mercury performance banner.
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The 428 had close to 400 hp with about 440 tq.
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