Fuel line size

Trying to determine what size fuel line to run on my car. The fuel cell is a -10 an outlet and the carb is a QFT 750 with a 3/8" input nipple. I'm going to be using an inline pump mounted under the rear of the car and filter in the rear as well. Should I run the -10 an from the cell to pump and filter and than change to -6 or -8 an or will -10 be ok all the way up to the carb? Just not sure because I've never worked with something only requiring a low psi. Or would I be better off running -6 or -8 an from the cell al the way up? Thanks!