[MARKDTN]

You don't need any electronics to run a 700R4. My '83 K20 was stock with Q-jet and 700R4. It has a wire for converter lockup and such but there is nothing solid-state involved-just switches an 12V no different than kickdown on a TH400. Choice of TH350 or TH400 that you know, I'd go TH400. But in your case I would get a quality built 700R4 by someone who knows them and adjust the TV cable before it starts the first time. Then drive it. The Q-jet brackets for the TV cables are out there in trucks, vans, MonteCarlo, Impala, Camaro....

My '83 K20 went about 80K on the original transmission pulling trailers and hauling before the front pump died. Got a GM reman with updates after that.