I've run a 12 gallon rear mounted cell feeding a cam driven enderle pump for years without issue.
Use a -12 line and you'll be fine.
We were doing 1.22 60 foot times with it. We're stepping up to a much higher HP motor and converting over to a front mounted cell for safety's sake.
Just make sure that the outlet of the tank is at the same height as the inlet of the front mounted pump and you'll be fine. Keep the tank topped off between rounds.