1984 Chevrolet k10 700r4 id help

Hey I have a 700r4 that came stock with the truck, but I'm not positive that it's the original. I will post a picture of the ID tag hopping someone more well versed with these transmissions can tell me more info about it. The truck is a 1984 Chevrolet k10 Silverado short box, from the RPO the transmission is correct, the motor is now a 350. From what I've gathered so far this truck uses the TV cable for shift points and line pressure, it has the break pedal switch to take it out of lock up, and uses the tip in switch for... I want to say telling the computer that it's okay to go into lock up I think, not 100% positive tho.

I'm reaching out to see if someone can help me with the ID tag, and want your opinions on whether or not I should keep the stock transmission converter lock up set up or should I go with B&M or some other aftermarket kits to fully control the 700r4's shift points and TC lock up. My shift points are way to early doesn't kick down when it should and just giving me overall poor performance with the current setup. Would love to hear something advice or solutions to better improve the driveability and overall performance. Thank you!

Hard to make out that tag. Maybe my monitor, I don't know, but I can't make out most of it. If I had to guess, it may be an 86 transmission which means it's not the OE transmission. Just due to time, I'd guess that's it's not. 82-84 were the worst 700r4's and not even good cores. If you're looking for another core, try to find an 88 or later. 87 is doable too, but 88 and up have the most changes and updates and finally started getting a bit more relaible by that time.

A 700r4 should have the original partial vin stamping on the passenger side rear above the pan rail.

If it has a tag adhered to it that would, to me suggest its been replaced/rebuilt at some point.

May just be a matter of adjustment