Rich, you can always take the stock fitting, drill and tap for 3/8 pipe thread, and screw an AN fitting into it, like i did...
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1968 Bird/TRW 455/Home ported 13's, '70 Qjet,Holley Street Dominator manifold, Comp Solid FT, 10.817/122.30/1.440
Workin' on E/SA combo
3119 E/SA