they use vacuum to shift, and have a kickdown cable. There will need to be a tee put in the port behind the carbuerator, to go to the vacuum modulator.
Why don't you like your 700? It is a better trans, if it is in good working order.
BTW, you will need to lengthen the driveshaft and change the front yoke for the 350.
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1974 Jimmy- 5.3/4L80e/NP241
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