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Re: 1972 K20: TH350 or 4L80?
Here is a thread with a payback calculator that will allow you to see how many miles it will take to pay for your conversion through gas savings. It of course won't calculate any change in the vehicle's resale value. Which may or may not enter into your decision.
https://www.67-72chevytrucks.com/vbo....php?p=8376137
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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,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 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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