It looks to be leaking at the adapter, not the inverted flare. The metal gasket normally has a coating to seal between the carb casting and the adapter. I would take it apart and inspect for any nicks or cracks in the carb casting. These are NOT pipe threads and rely on the gasket to seal the fitting. I agree with coilover, add a piece of rubber fuel hose in the line to reduce the tension on the fitting at least until you fab a new line. The inverted flare also does not rely on the threads to make the seal, it's the flare face and seat that seal the joint.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy