Rebuilding an old carburetor rarely works out unless you are meticulous and know what you are doing.
Sounds like the carburetor. Choke not adjusted properly (cold idle), clogged jets or any of the many, tiny passages in a carburetor, improper tuning, etc.
If its legal there, I'd put a new Weber conversion on the car.
K
The coil pack has two coils in it along with transistors (ignitor) to fire the coils. The front two cylinders share the same coil and the two rear cylinders share the same coil, so two plugs fire at the same time. (wasted spark) Get a coil and plug wires from a scrap yard. You don't want an aftermarket coil. If you buy plug wires or spark plugs, get NGK.
I found this on an Outback forum:
" i had this similar issue for a year and I solved it so. it was merely a poor ground issue. i removed the ground wires that were connected to the manifold and screwed to the firewall and near the fender. they were corroded and i sand papered all these areas and also reinforced those grounds with thicker wires and problem was solved immediately. i spent over 800 dollars in coils until I really had to sit down and think."
Grounds are really important in cars. I once had a Pontiac that was almost impossible to shift out of park because the transmission cable was trying to weld itself to the housing. The ground strap to the transmission had broken and it was grounding through the cable / cable housing.
I'm going to try cleaning up the ground strap. It may take me a few days because I'm busy with a charity construction project for a little old lady whose house got flooded and my foot got run over by one of those big steel carts in a home improvement store while buying flooring materials.