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I will have a donor steering column from a suburban with tilt, cruise, and delayed wipers. By the time I am done with it, it will look like a custom deluxe but have the comforts of a Silverado. Why do you say "yes they did come behind 4.3's Not sure why, but they did"?
FWIW the TH350 short tail shaft is your best bet. In 86 GM had already phased out the TH350C and the standard 3 speed automatic became the TH400.
The thought was buying a radiator from rock auto for a 5.7 that comes with trans cooler ports. Then I won’t need the external trans cooler. Then it should just be standard lines from transmission to radiator.