A couple of questions..

[tree98]

I noticed you have a 2.64 rear end ratio. You really need to think about regearing to something like a 3.70 or 3.90. That 2.64 is gonna knock the liners out of that engine very prematurely.

You want to keep your RPM's at or above 1500 when your working the engine hard (using 50% or more throttle) and that's basically impossible with a 2.64 ratio. Lugging an isx down below 1500 all the time is one of the things that kills them quickly.