should I use the 2 barrel TBI with dual 1-11/16" bores I have or get a singe 2" bore TBI?

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FuelInj_pics/517-1.jpg (http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFIA/517-1.html)

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FuelInj_pics/17-41.jpg (http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFIA/17-41.html)

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FuelInj_pics/17-45.jpg (http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFIA/17-45.html)

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FuelInj_pics/17-46.jpg (http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFIA/17-46.html)

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FuelInj_pics/17-47.jpg (http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFIA/17-47.html)

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FuelInj_pics/517-2.jpg (http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSFIA/517-2.html)