Fuel Starvation / Mechanical Fuel Pump

Could sure use some help. Leaving for Power Tour in 2 weeks.

I'm running a mechanical fuel pump on my 360ci/380hp Magnum crate. Just did a few miles in the car and suddenly the car dies while cruising at 40-45 mph. I have a clear fuel filter between the pump and the carb and there is barely any fuel in the filter. Once the car is restarted, I can see an insufficient amount of fuel pumping into the filter.

This is my second mechanical pump I've had in the car. The first was an Edelbrock and the current one is an aftermarket parts store special.

Is a mechanical pump incapable of supplying the amount of needed fuel for this motor? Is it time to switch to an electric pump? Any and all help is appreciated!