The TV cable on these has to have the correct geometry! Impropper TV cable setup will kill the 700R4 in a hurry. One of the auto magazines had a good setup photo some time back. I will look for the page. It will not work to just get close to the setup. There is also a company online that makes a setup for attachment on Quadrajet carbs. It may be adaptable. Search for it there is good info on that site
Lockup can be done in the transmission with switches. There is no computer needed. The overdrive automatically locks up after the tranny is in 4th and pressure comes up. Any tranny shop can do this, it's common with rodders. The lockup is then switched off when the brake light comes on, at least that is how my street rod works. My street rod also has a vacuum switch. If the vacuum drops the lockup unlocks. That part won't work with boost. There could be a switch added to the accelerator or on the injector pump that unlocks the lockup with full or near full throttle application.
Use care with bolt selection bolting the converter to the flywheel. The bolts cannot hit the converter shell. The lockup clutch is right behind the shell where bolts would hit. If the bolts bottom on the converter the clutch band is broken inside the converter. This will lead to a 200 to 400 mile transmission destruction. I know I did it twice before figuring out what the problem was. Both times I had to have a trailer come to retrieve my street rod, it was DOA.