I beleive you have a 4g63 n/t they are 2 liter stock. try here:
Model Guide: Eclipse 1Gb - DSMtuners
welcome to the community and good luck on your build
edit: i dont think you can get a 4g up to 2.5 liters 2.4 max if im not mistaken which means its probably been bored out to 88mm awith a 100 mm stroker crank.