[84LX89GT]

If you do decide to bypass the Torque converter clutch keep these things in mind: gas mileage will suffer and the transmission will overheat unless you get a bigger oil to air cooler. Also unless you get a custom chip to bypass the TCC your processor will send a code for it, it reads the input shaft speed sensor versus the output shaft speed sensor to check for lockup when it is commanded. Good luck, but i personally think unless you're doing serious drag racing it's pointless, most of the shifting in and out that's noticable in those cars is from drive to overdrive which has a button to disable. a light tap of the brake and the TCC is disabled quickly.
If you want a car that drives the way a car did in the 60's in terms of auto transmission get some 3.73 gears and drive without the overdrive on (leave the button pushed in).