Andres, I had a 1997 Top Kart at one point, though it was a “Top 125” shifter. It was nigh indestructable, but very stiff, which might not be the best for your relatively low-power engine. The good news is that the parts can still be got, as most of them are generic rather than unique to TopKart.
Regardless, your alignment specs are going to depend as much on the track you race as on the brand of chassis. I’d go to the track with a neutral front pills, 4mm of toe out, a medium axle and hubs, front and back track at maximum, center ride height (i.e., very standard starting point) and take it from there.