What size braided fuel line? -6 or -8 for sb400

[Hazieview]

Hey guys I just got my aluminum fuel cell in and I'm ready to buy some braided fuel lines. However I dont know which fuel lines I should go with. I already have the -6 dual feed from edelbrock. Check it out:



Brand Edelbrock
Manufacturer's Part Number 8128
Part Type Carburetor Feed Lines
Product Line Edelbrock Dual-Feed Fuel Line and Filter Kits
Summit Racing Part Number EDL-8128
UPC 085347081288

Inlet Quantity One
Inlet Attachment Male threads
Inlet Size -6 AN
Outlet Quantity Two
Outlet Attachment Male threads
Outlet Size 5/8-20 in.
Fuel Line Type Tube and braided flex line
Adjustable No
Fuel Filter Included Yes
Gauge Port No
Fuel Pressure Gauge Included No
Fuel Line Material Stainless steel
Fuel Line Finish Chrome
Fitting Material Stainless steel
Fitting Finish Chrome
Quantity Sold as a kit.
Notes Kit includes polished fuel filter.

My sb400 should be making around 580ft lbs of torque. I've heard some say the -6 line is too small. So should I run the -8 line to my edelbrock fuel pump or the -6 to match my existing dual feed fuel line?

Also my fuel cell is all the way back to the rear crossmember so should I need 15' or 20' in your opinion? Thanks guys!