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Lizzy, you would know better than me, but aren't the external pump systems supposed to be gravity fed? I figured that's why people always sump the tank rather than use a hat like the setup you have.
Filter-pumps-filter
Both 255 lph
Second pump comes on at about 5psi boost
Gonna run you around 1400 or so, adds up especially the numerous fittings
OP if you are happy at or just under 500 rwhp you can use stock fuel lines, SVT pump and BAP, I am also using 60 lb injectors and you are good to go.
This is what I ended up doing as I didn't want to shell out another $1400 for additional power beyond 500 rwhp. Also if you are looking for beyond 500 rwhp you should go with a nice set of heads as well.