I had decided that I would try modding the original downdraught carb instead of fitting twin sidedraughts, mainly for fuel economy reasons! I know that I won't get as much power, but hopefully with some well chosen mods I won't loose too much. Here you can see that I've taken the standard inlet manifold and enlarged the ports to match the head, I've also drilled the manifold and head to take dowels to ensure optimum alignment.