Fuel Pumps

[FatBoy]

I'm in the final stages of assembling my Kirkham. It has an electric fuel pump as fitted as standard by KMS, but the engine as supplied by Southern Automotive also has a mechanical fuel pump.
Am I OK connecting the outlet of the electrical pump to the inlet of the mechanical pump, or do I need to remove one of them and if so, which one?

Your advice would be appreciated.

Thanks,
Paul

[nevermind65]

What brands and what output are they? I've done this many times with the old Holley red and blue electric pumps and a cheapie mechanical pump, but with the killer pumps they make today, I'm not sure I would go that route anymore.