Will a TH350 column shifter work with a 700R4 overdrive transmission?

Here is what the documentation says. Each point links to its source; details depend on your exact computer, harness and transmission.

• Classic Chevy lists Shiftworks shifter conversion kits with a new shifter detent and console indicator that let factory 3-speed shifters (TH350/TH400/Powerglide) operate 4-speed overdrive transmissions including 700R4, 200-4R, 4L60 and 4L80E. (Classicchevy)

Confirm against the instructions for your exact parts before wiring. More: Transmission control in our tuning guide.