i had your manco about 6 years back. here's a link and some pics of what i did to it. overall it was better and fun to do.
used a yerf spider box and did a rack set up for steering changed the seats , shocks and made an exhaust for it too.
https://www.facebook.com/media/set/?...4539882&type=3
and here is a similar silverfox project i did.
https://www.facebook.com/media/set/?...4539882&type=3
if you access the links let me know, but the photos are in sequence of how it started and where it ended up.
this was one of my first projects done in my home garage so some of the stuff is a little sketchy for my tastes and work now , but the general idea is there...............brings back memories.