First of all give some sadqa in the name of Allah SWT who saved your brother's life. 120km is too high even for some new cars leave alone a Mitsu 86. Rebuilding this car doesn't seem like a good idea. The choice is entirely yours but considering that a good rebuild may cost you as much as the price of this (Mitsu 86) on the market, you are better off selling it to the scrappys and adding more to buy a clean ride - even if it is another Lancer 86. It all depends on how deep your pocket is. If I am not mistaken, a decent 86 would cost you between 180k to 220k. Rest, it's entirely up to you.