Dougboiler 91,I think you are looking for one of these units.Here it is:
http://www.horizonhobby.com/Shop/ByC...rodID=ZEN12310

Another option is to get yourself a "twister" manifold from Carr Precision which will also do the sane thing as the Zenoah unit.Scroll down to the bottom of the page to find the information on this unit.It sells for $12US if your interested.Sure makes setup a lot easier.Here's their web site:
http://www.carrprecision.com/Pages/prod02.htm

Carb spacing shouldn't be a problem as most of the carbs on these size engines are either Walbro or Zama and are od similiar size.They are spaced the same between the bolts usually.