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Re: Fuel tank filler neck
This drawing I found and crudely added added to may help explain. You don't want fuel puddling in the fill. It will block air flow out of the tank and additionally can make the pump nozzle shut off.
My addtion to the picture shows a low spot that is below the bottom of the fuel inlet to the tank. This is where the fuel will puddle and cause issues filling the tank.
Are you planning on running a vented cap or using some sort of evap canister set up?
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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