My vette with the 468 and 4.11's and a 4 speed would do about 3250 at 60-65 mph, due to the motor being an LS7 it liked the RPM's and was "a lil sloppy" down low but then I didn't mind it, that was also with a 26 inch tire. The Camaro with the blown 447 I was running 31x18's with a 4.56 spool. You never stated (unless I missed it what tire diameter your running) will directly effect your true ratio. Sounds like it will be a fun toy when ya decide which direction you're going to go...