I think I'm going to go with the Holley 670 TBI, as my stock unit is acting up, I think the injectors are bad. Anyways, I heard that you need to adjust the throttle linkage to get the 670 to work on my '90 RS. Anybody do this? If you have, can you explain how?
Thanks, Roy

 

Linkage....
I didn't seem to have any problems but I will show you the hookup I had with my Holley...
Hope this helps you.
Notice the cruise bracket. I had my friend cut the one off the original and weld it onto the Holley bracket. I don't think you can use your stock bracket, You can try I guess.

 

It's rather simple. You don't need to modify the bracket like in picture 3 unless you've got a vortec style intake manifold. You can see that the holley unit flip flopped the throttle and cruise control. I don't have cruise anymore because it wasn't working well with the new 3.73 gears and 75mph just wasn't smooth anymore. I don't need cruise anyways, my foot position basically sets the speed of the vehicle anyways (lots of power ).
You might need to bend the bracket a bit to get it to reach. Make sure that the tranny TV cable is not loose!!! It should be tight! Don't fry the auto clutch belts by leaving this too loose. If you don't have it hooked up it's a whole nother story, also not good.