What V6 Is This? 1977 Chevrolet Vega Sedan Delivery

Do you ever find a listing for a car that leaves you with more questions than answers? What about a sedan delivery version of the infamous Chevy Vega that has a modernish DOHC V6 shoved under the hood. Where did that V6 come from? Why would you not include that little sprinkle of information in your listing? Maybe the seller doesn’t known what kind of V6 he/she is looking at, because I don’t. I’m sure someone in the comments will educate us. Find this 1977 Chevrolet Vega offered for $7,500 in Mesa, AZ via craigslist. Tip from Rock On!

From the seller:
1977 chevrolet vega
condition: good
cylinders: 6 cylinders
drive: rwd
fuel: gas
odometer: 77000
paint color: yellow
size: compact
title status: clean
transmission: automatic
type: wagon

1977 Vega delivery wagon, 3.4L Hemi V6 engine, runs great. Cold A/C, automatic W/OD. Great interior and very good overall condition. Thanks for looking, call Glenn

See a better way to drive something yellow? tips@dailyturismo.com
The googles tell me LQ1 for the 60deg GM V6.
Looks like the motor GM put into the Lumina Z34 and Pontiac Grand Prix GTP; their first entry into the DOHC V6 game. Not sure about the long term reliability of these engines; but a nicely presented and engineered Vega, all the same.
I’m similarly curious as to what AOD transmission they used …
The ad says it’s a hemi v6.
Which it probably is not with 4 valves per cylinder.
Looks like a LQ1, but how’s it longitudinal like that? Is there a fwd to rwd adapter? Chuck the differential and tie the driveshaft to where there once was an axle?
It’s quite a riddle.
I’m guessing the builder grabbed a 4L60E out of a V6 Camaro; it probably bolts right up.
Hmm, apparently not a big deal at all
http://www.60degreev6.com/vb5/forum/dohc-engines/dohc-general/25821-rwd-lq1
It sure looks like the 210 hp Z34 engine like in this car.
https://barnfinds.com/27k-original-miles-1993-chevy-lumina-z34/
Honestly, that engine looks like the generic version of “engine” you’d see in an anime that isn’t about cars.