You would use a 2BBL adaptor for your Offy or Clifford intake manifold.

http://www.ebay.com/itm/Mr-Gasket-1929-C...6076d08&vxp=mtr

http://www.ebay.com/itm/Q-Jet-Spread-Bor...0477729&vxp=mtr

http://www.amazon.com/Mr-Gasket-1933-2-B...+barrel+adaptor

IIRC, offy made/makes a 2 bbl adaptor that is nicer to use than these universal units.


MBHD


12 port SDS EFI