I run those exact tires, but never measured them. They always seemed small to me for the foot print based on advertised width, but I run them on a 15 wide rim....I do not have as tight of wheel well as you, as I can go to a standard 14x32 slick and fit them with no trouble.

PS great all around DOT tire....1.33 60ft with them on my car, but mine are getting down there in tread.

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk