Ian,
NOTE: IT IS THE METHOD PIONEERED BY DAN, I JUST COPIED IT.
I hadn't responded earlier because it looked like your adapter plate was already in the works. But since it is not yet made, here is what I did with same carb and manifold as yours.
I started out trying to elongate the carb holes but that seemed like it was going to take a very long time.
So I removed the manifold studs and filled the existing bolt holes with threaded aluminum pieces that I made by threading some 5/16" rod that I happened to have. I cleaned the manifold threads and the new inserts with lacquer thinner and used JB weld to glue them in place. Then I drilled and tapped new holes in the manifold to line up with the carb holes. Reinstalled the studs and I was done.
Note that I moved all 4 studs; that is because, if I just moved the studs at one end and left the other studs alone, the new stud holes would cut into the manifold wall. By moving all 4, all stud holes are on the outside of the manifold wall.
Brian
NOTE: IT IS THE METHOD PIONEERED BY DAN, I JUST COPIED IT.
I hadn't responded earlier because it looked like your adapter plate was already in the works. But since it is not yet made, here is what I did with same carb and manifold as yours.
I started out trying to elongate the carb holes but that seemed like it was going to take a very long time.
So I removed the manifold studs and filled the existing bolt holes with threaded aluminum pieces that I made by threading some 5/16" rod that I happened to have. I cleaned the manifold threads and the new inserts with lacquer thinner and used JB weld to glue them in place. Then I drilled and tapped new holes in the manifold to line up with the carb holes. Reinstalled the studs and I was done.
Note that I moved all 4 studs; that is because, if I just moved the studs at one end and left the other studs alone, the new stud holes would cut into the manifold wall. By moving all 4, all stud holes are on the outside of the manifold wall.
Brian