thats the same jets i run in my 250.
i think its a 68mm q pipe, 250r eleminator intake with k&n. v2 reeds.  but that is for 70 deg plus.
and mine runs great i thought i might be a bit lean, but plug chops look good.
go bigger and jet down till you get it dialed in.

where is needle clip at.

not sure if it matters but my carb is a air striker bored out