Type and size of Gen 2 Manifold Fuel line fitting

[Deskota]

I'm doing a resto-rod using a Gen 2 Viper motor. To maybe save some time, and trial and error, Can any one tell me what the bore size and thread size is for the female fuel line fitting machined into the rear of the manifold? Is it NPT, AN or SAE? It looks to be about 5/8" across the threads, 1/2" bore with machined taper at the base of the hole. I tried a NPT 1/2" right size, wrong threads.