If its a standard Mitsu pump, you can either use stock DSM pump, RX-7 TT pump, Supra TT Pump, or an in tank WalBro.
Stock DSM pump: 100lph@37ish, $free-100
RX-7 TT: 210 lph@43, $75-125
Supra TT: 295lph@43, <$200
WalBro: 195 or 255@50ish in tank, $100-150
http://www.roadraceengineering.com/fuelpumptechtip.htm
http://www.roadraceengineering.com/fuelpumpflowrates.htm