RE: K&B .65 Sportster (yup, more from me)
Can you get a better picture of the spray bar slit? From what I can see in the picture, the slit looks bigger than the one in my carb. Maybe with a better picture I might be able to tell more but it does look like the slit is wrong. I had a carb many years ago that wasn't right and K&B sent me a new spray bar because the slit was wrong. If I remember right, it sure looked like that one of yours.
The slit in mine is very hard to see. I thought about taking picture but it's so small, I don't think it would show up.
If you can get the low speed disc, it may run just fine. I figure they only sell it with the remote needle which means buying the remote needle assy. also.
Looks like you can still get the original low speed disc.