You need to use a non-feedback carburetor, if it still has one
For stand alone a manual choke cable maybe, but electric automatic choke would work as well
You want to use a Duraspark distributor and coil with an HEI module, basically a one, 12volt, wire spark system, with vacuum advance
Not sure "they" make a Coil On Cap HEI that fits the 2.8l but would make it much cleaner wiring wise
You should run a PCV Valve and breather hose to air cleaner housing(filtered air), it helps prevent valve cover and oil pan leaks
You can loop the heater hose unless you want to add a heater core, but don't block these ports off, loop them, its the by pass for the water pump
Outside of the vacuum advance and PCV Valve no other vacuum hoses are needed unless you need one for automatic transmission