TBI is a 1 bar pump (15 psi) MPI is a 3 bar pump (45 psi). They all flow between 40 - 60 GPM at 0 head for a stock vehicle.
Aftermarket pumps can flow up to 10bar and 600 GPM.
Chris, I would look into any in-tank pump and mount it within a small reservoir with both a supply and return line or look to get a used Holley DFi pump off of ebay.