Slant six single, to slant six double.

Spending a LOT on a /6 is not worth it in my opinion.....because at the end of the day it is still only a 6 cyl.....& still only 225 cubes.

I would put a 2bbl Weber carb on it. Racetep in Calif or Clifford Performance will have what you need & can probably supply the correct jets, emulsion tubes, etc to make it a bolt on deal.