Does anyone have an optimum configuration for the 13B as a NA engine?  How would you convert a 89 6 port to a 4 port engine?  Just grind the end housing ports to form one port?  Or is there a 4 port type end housing that could be used like a turbo II end housing.  I am starting with a 88 NA and a 89 NA.  Thanks for any help.

Joe Berki
Limo EZ