I love the way this thread is going... Yes, I totally adore the column shifter, and a split bench seat. Now here's a strange one... My regal that most would consider a "tank" weighed 300 pounds less than my grandmother's old 1981 AMC Spirit. It was built like a tank though. Seemed like everyone in the family had mishaps in that car, but it seemed impossible to dent. I even ran into a tree at about 30 MPH backwards (Long story, maybe I'll tell it later) and it didn't even scratch the car. I also remember the doors didn't shut right, so dad & I had bought new hinge pins & bushings to rebuild the hinges. After we took the doors off the car, my dad & I could barely carry them into the garage.
And back to the Buick... I recommend getting a distributor out of a 75 GM vehicle, and put a high performance coil in the cap. That's all you need. Then get some AC Delco Platinum plugs and some quality wires and you're good to go. I always loved the Niehoff wires. I haven't bought wires for my older vehicles in a while, don't know if Niehoff is still around, but the wires were nice, and even had the nipples on the tops of the boot for the distributor ring. New AC Delco wires for these vehicles no longer have the nipples.
Before I bought my first truck (The 74 Chevy) if we needed a truck my dad would borrow his friend's beater, a 74 Ford F100 with 3-on-the-tree. It was kinda fun to drive, even though the play in the steering box was 3/4 turn of the wheel.
3,000 pounds? My Regal would qualify... The only problem is that even adjusted the original EPA figures are way out there unless I do some extreme hypermiling, and I'm not doing that with a car nearly 30 years old.