You need a new dist. because the computer controls when the spark fires so the old one does not have the abilty to run the engine. Youll need to either plumb a mechanical fuel pump or rig the old electric one to work with a carb. Also some cars have the cooling fan run by the computer too so you will need to rig a switch to manually turn it on or run a tempature switch on the engine.
Just get a regulator for the fuel, an HEI distributor for a one wire hookup and your cooling fan if it's the original electric fan is activated by a sensor on the passenger side under the exhaust manifold. I did a similar swap in my 91 RS.