Hmm, well the reason i asked was because of possible emmissions limitations that you might have on the vehicle. For example, here in california, your van would be required to pass an emmissions test and it would be illegal to use any old aftermarket carb (i.e. the edelbrock performer 600).
However, Edelbrock does make an emmissions legal 600 as well as a direct replacement 750 cfm quadrajet so you cold look into those as well.
good luck!
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so much to do, so little time.....at least i aint bored.
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