That is just the throttle body for a multi point..
I went with this one... its the 4150 base.. 1000cfm
http://www.summitracing.com/parts/hly-550-500
or if you want to use a 4500 base they have this one
http://www.summitracing.com/parts/hly-550-501
you still have to buy injectors and the pump... talk
to Monte for a price.. he helped me out
EDIT
also being that its a dry throttle body its just
air so its more air than the same size as a carb
thats moving both air and fuel