UPDATE: That R3615 kit is NOT working out: the needle valve is much too long, the base gasket doesn't fit the mounting studs, no inlet fitting/valve o-ring provided, the idle screw won't bottom (the end taper is too gradual), and the sealing washer for the inlet fitting/valve is too small. This is all despite emphatic email assurances it would fit this carburetor.

I'll follow up as to Daytona's efforts to make this right, but as of now they're not scoring real highly.