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if aAN -6 you would use a edelbrock /carter fitting it is 5/8 x20 to -6 then make a insert for the 45 to seat to and your done .if the bung coming out of the header tank if the bung top is flat you...

i think i can make up the 5/8 -20 with flare .if you can not get them i have made them up before your looking at it to go to AN 6 or 8 or i can tell you how do it if you have a mill and lathe or...

for your small AN fitting look at a AN JIC fitting there steel and 37 they can be found at any place that make hi psi lines up . i used them fittings or rework them to make up fittings .for the...