Not Ranked
The numbers I was quoting were from listings I have of Ford crate engines (which is essentially what Shelby was buying) available during the 60's.
There is truth to what Ernie says about the the numbers being "conservative" all engine mfg's will quote a "minimum base line HP rating", in some cases it was real conservative like GM's rating on the L88 427 (rated 430HP @ 5800RPM but failed to mention that it red lined at 6500RPM and would produce in excess of 525HP).
The 426 Hemi, and Boss 429 were very conservatively rated at 425HP.
However at that time high compression (and good gas) was needed to produce these numbers. Still remember laughing at the sticker in my old Pontiac that read: "Your new GM vehicle only requires fuel with a minimum 91 octane rating, so it will run fine on regular gas."
The engine builders today easily produce 600+HP with 10.5:1 compression as long as they don't use any vintage components
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