Well herea how I did it, you dont need many tools, and it took me about 30-45 minutes to complete. All you'll need is
Flat blade screwdriver
5.5mm socket
8mm deep well socket
10mm socket
Ratchet
T15 bit
T25 bit
1/8 drill bit
Drill
And a pocket screwdriver is handy.
First off, remove your throttle body, remove the intake hose from the intake hat using your flat blade screwdriver, and then remove the wing nut from the intake hat.
Remove the wing nut stud with the 5.5mm socket, and then remove the throttle cables from the throttle blade. Cruise control cable simply pushes back, and in clips.
Then remove the upper throttle cable bracket bolt using the 10mm, and then remove the 3 8mm throttle body bolts. Then the throttle body comes out.
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Now this should be what you have laying on the bench, remove the two T15 screws from the butterfly valve, and hold the throttle wide open to remove the blade. It should just press up and out.
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Then you'll need to remove the TPS using the T25 bit
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Once your TPS is off, take a small hammer, and tap the rod out of the throttle body housing, it may take a little bit of force, but dont Heman it. You should be left with something along this line
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Now the 350 TB have a yellow spring, 454s use this purple spring. Hang onto the yellow, unless you want a throttle that a feather can hold at WOT.
Now do the same process with the 454 TB, and the linkage rods will be swapped from TB to TB due to different configurations
454 in my hand, 350 on the throttle body. Both in the same throttle blade positions
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Next thing you want to do is clean, if you're like me, and picked up a throttle body from the J/Y, then it will more than likely be covered in grime, and carbon. Clean it with carb cleaner, and a brass wire brush. Clean to your liking and then, it's all basically reverse order, use the 350 throttle lever in the 454 body, and reuse the 350 throttle lever spring.
Once the 454 throttle body is assembled and installed back onto the intake manifold there are a few things that have to happen to get the intake hat back on.