5/16" Fuel Pump Inlet for 340?

domdart said

Are the more expensive fuel pumps worth the money? I can get a Mopar Performance 80 gph for $45, a Carter M6902 120 gph for $75, or any of the more expensive ones at $150 and up.

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It's not a matter of 'worth the money'... it is a matter of do you have an impending problem or not. It all depends on if the individual pump you have exceeds the stock published Carter rating of 25 GPH or not....some will but some won't. If you are pulling 400 HP, and the carb is decently tuned, you will be pulling around 35 GPH flow rate, and that pump is rated at 25 GPH. No one here can guarantee if your particular M6866 pump will support that higher rate or not.... If you run the carb lean, things might be OK, but it might not. The risk is a burned piston top....seems unwise to me to not spend up to $100 for a pump upgrade.

From some comments on FABO, I'd avoid the M6702 which puts out a higher pressure level and can overwhelm the needle and seat on the Holley.

The mid priced ones that you mention should do the job... but I can't say anything + or - about $20 Autozone Airtex pumps LOL