The new throttle assembly all ready to go. I have already removed the bellows.
There are five screws that hold the air horn to the throttle assembly. Once removed you can disconnect the MAT sensor electrical connector and the large vacuum hose above.  
Once the air horn is out of the way you can see that there is a small hose which connects to the under side of the air horn.
This is a view of the throttle assembly. Note the two large black torque head bolts close to the center of the throttle assembly. There are two more of these on the outer edges.
Another view of the small vacuum hose. Don't forget to reattach it when reassembling.
The back of the air horn. I studied it carefully in order to recreate a new gasket.
The four bolts to remove are indicated.
The small radiator hose on the driver's side should be clamped off to prevent a mess.
The four bolts are size T-40.
The four bolts are out.
By placing the the new throttle body on some 1/16 in thick gasket material you can trace out a new one.

Just a little cutting and you are done.

(Note: These gaskets are available from Gerry's Gaskets and White Racing Products)

The torque setting is 20 ft/lbs for the four bolts.
The new assembly is in. Now it is time to reattach all the goodies.
The air horn and bellows go in quickly as do the electrical connectors and vacuum hoses.
Now all that is necessary is to calibrate the throttle position sensor.

Other Links:

Jerry's Gaskets

White Racing Products

Author: Scott Fabre
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