I have the same problem with mine. I plan to replace the 255/60s & put on 275/60s. I also plan to ditch the 4.11s for 3.73s.
When its time for this 454 to be freshened up Im gonna kill of some low speed torque intentionally for more mid & upper power. Infact I might yank the Performer intake off & put on a singlr plane.
Itll spin posi for a city block if I let it . with a borrowed set of 9x29.5 slicks it ran a 13.80. with regular radials.with street tires Id be lucky to get a 13.80 60 ft. LOL. John