I was going to say 4.10's until I saw that 150 shot
depending on how high your letting it rev I would probably go 3.73's or 3.90's if it was me.. I'm guessing you could probably run around 125mph so on 26" tires that's 6305 rpms with the 3.90's or 6030 rpms with the 3.73's. I may go with 3.90's and run a 28" tire at the track.. that would drop 4-450 rpms off at 125mph compared to the 26" tire. just some thoughts.