fuel pump fitting?

[pcmcobra]

On my 86 w/ 305, on the mechanical fuel pump outlet to carb. What size /thread is that? Have been having a heeluva time findind a fitting for it.
I tried some of those brass 3/8 from autoparts store, they will screw in, but could not find the 90 elbow I needed.
So I bought 3/8npt to -6an to run braided line, and it won't fit, fitting is too big.and it's not 1/4 either.too small.
Are the threads in the fuel pump different or what? I have been to every parts store in town, and can't get the right stuff.
I've got a little too much $ tied up in the rest of these an fittings/line/filter to turn back now.
thx for any help.