Hey dude cool car. My girlfriend had a KE35 2door sedan for a little while. Same color as yours and white interior.
Unfortunately some idiot kid owned it a few owners back and put on a tacky momo steering wheel and did a closed-door respray so paint was chipping and peeling in places.
She ended up selling because it was too tiny and felt unsafe but hey who cares. I would have loved to keep it and use as a daily for myself but have no garage space. Coupe is way cooler so you're one step ahead!
Don't spend money on modding the motor. It's a trap so many kids fall into. Per dollar spent, bodywork is a way better investment. GF's had a 4k put in and even with the 2spd auto it puttered around in traffic fine.
Honestly don't spend a cent on the 3k. If you want a new motor, 5K is not too expensive. 4AGE will be awesome fun in such a light car and they're not tooooooo pricey either. Lots of revs, sooo much fun! But just leave the 4age stock, not worth the effort doing ITB's and all that shit. Personally think you should spend the $1500 (at least) for motor conversion on some cool wheels, mirrors, venetians, front lip, and whatever your heart desires to make it look cool as FARK.
I have a pair of 14" techno TRV rims for sale if you'd like them. Not sure on your location but I can post them for $250 + postage (between 30 and 50 extra). They look like this:
Shoot me a text on oh422 oh56 272 if you're interested.