Restriction on the inlet side of the pump is a bad thing.
Personally, I'd run -10 from the tank to coarser pre-filters and -10 from the pre-filters to the pumps, then -8 out of the pumps to the regulator, then -6 or -8 from the regulator back to the tank. Run the return line the same size as the feed if you want to play it totally safe. I'd also put a fine fuel filter just before the fuel rails to keep junk out of the injectors (or carb.)
Are you going to run the 2nd pump off a Hobbs switch? If so, I would "tee" two Hobbs switches together for redundancy, so if one fails the other one will still turn the 2nd pump on.
Troy
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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