Electric pump before or after mechanical

318 +.030
Zero decked
KB167
RPM AG
Eddy 1405 W/ 1” phenolic
Eddy mech fuel pump
Stainless fuel line insulated in the entire engine compartment

I suffer from the warm start issues and when I open good, my fuel pressure gauge shows 0 and the bowls are empty.
I have read on this site about installing lv/lp electric to help with this issue but cannot find it now.
Do I install it before the mechanical or after?

Thanks to you guys for the help!