I am considering the Go-Tech 7port race motor for use in my Inferno GT for on-road racing. Have the carb leaking issues been resolved?

Is the bottom end on these engines enough to power a buggy based GT out of corners with authority? Would the 5 port be a better choice?

Is there an on-road specific .21 version now? Should I go for the Turbo button version?

Any advice is welcome.