Rough idle and start

Don't forget ALL of the places vacuum runs. A/C/heater controls, manifold mating surface, vacuum canister and vacuum advance.

Slants are notorious for having hot start issues, engine bay heat soaks the carb after shutdown and boils the fuel out of the carb ( flooding ). This also translates into cold start issues because you have to crank the heck out of it the next morning because the bowls are empty.

On my car ( when it had the slant ) holding the pedal wide open during hot start will allow it to start quicker and idle better sooner.
Here in FL, I had to add a heat shield under the carb to get it fixed.