TWM makes aftermarket TBI throttlebodies. The generally mimic the shape of Weber sidedraft or downdraft carbs:

[Linked Image]

[Linked Image]

On the 20R, you would need to use their TB with a sidedraft intake manifold. On a V6, you would need to make a custom lower intake manifold.

-Jeff

Jeff Moskovitz
1986 turbo 4X4 truck
1998 2.7L/M5 4X4 4Runner

Jeff's 22R-TE page

22RTE Turbo Truck Forum (advertising free)