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Re: NV4500 vs SM456 vs SM420
Take a look at the Novac web site. They may have the adapter you need plus they are w wealth of information. They were great when I was rebuilding my SM420 and NP205.
https://www.novak-adapt.com/knowledg...ssions/manual/
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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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