well tuning the engine... chipping a monopoint is kinda pointless, costs as much as a 1.6 8v engine..
get a head and ancilleries of pug 106 xsi or Ax Gti, will get you about 100 hp, if you have a carb, you could get intake manifold/ carb of AX GT for 85 hp or double carbs from AX sport or pug...