I think you may need to sign up to www.twincam.info
and post the issues up there.
Rev problems can be cause by(from my experiences):
Air in the coolant lines. You need to open radiator when cold, turn your heater on heat and on if you wish, and let all the air bubble out while topping up with coolant.
Timing issues. Triple Check timing, spark plugs, leads, coil, ignitor, dizzy cap and rotor button.
TPS out. Not sure how to fix this but can cause some issues alike this one.
If you have a diagnostic plug still wired into the loom you need to bridge two terminals with the ign to reds. Use google to find out how to do this.
Could be more things wrong with it but they are the main culprits.