Theres usually and aircraft style safety wire locking your fuel screw to its original position. If its not there, somebody turned up the fuel for a free couple HP's.
Just fab up your own manifold. There are some pretty simple log type designs that could be done blindfolded.
I just used the stock manifold for a template. You drill one hole then bolt is to your flange. drill the second hole, another bolt. Then drill the rest.
I tacked everything together and...