You're looking for something like this:

http://www.summitracing.com/parts/edl-1481/overview/

There are other options though http://www.summitracing.com/search/depar...Order=Ascending

You MAY still need a longer throttle cable, but the adapter is usually a necessary first step to avoid having to rig anything up dangerously.

I'll throw in that I've swapped 273 2 barrels out for 440 4 barrels and not needed to change the throttle cable. Your mileage may vary though

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street