Thats a belting little truck. I had a 410 a few years ago and loved it! Screaming little engines, janspeed used to do a full system for them too and iirc you can bolt on a metro carb or similiar for a bit more go, tbh though the original carb properly set up should be trouble free. In the main if you have a bit of mechanical sympathy they're pretty hardy!

It could just be the pics but it looks like the springs have sagged because of the shackle lift, they tend to if its done on old/tired springs. I'd look to invest in a proper set of lift springs with some d-flex shackles for some proper flex.

Loads of places for mods out there, Rhino Rays, KAP, Off road Armoury, Bits for Vits.