high volume low pressure piston lift pump for your VE pump First Gen Cummins. 
Unlike other low pressure piston lift pumps these have the larger diameter piston, which push about 25% greater volume.

this will support the other power mods you have done like a fuel pin, gov spring, injectors and turbo. 

This is a replacement pump for a previously converted truck.  

For a complete conversion kit LOW PRESSURE PUMP KIT