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Re: 1972 quadrajet 4MV. :(
The problem with throttle shaft bushing wear is exacerbated by too much throttle return spring tension. All of the return springs I have found these days at too strong. If you find a stock spring and check the tension you will find they are not very strong. If you add a second spring you have doubled the wear potential on the throttle shaft. I have modified the springs on my 1406 to get positive return at low tension. Notice the spaces between some of the coils on both springs.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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