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Sounds like it could be a dirty or faulty idle air control valve.Take it off and clean it with a wire brush and a non-chlronated brake cleaner or replace it with a new one.Make sure you reset the computer after cleaning or replacing the valve.
You can use any 305 motor. Like you said you will have to exchange parts from your old motor to the new one. Just make sure you don't go to far back, because the old 305's don't have the injector ports. Then you would have to replace the heads also.
Untill recently GM didn't change much of anything as far as bolt paterns You could bolt up a 350 from 20 years ago to your transmission and motor mounts. But that is not really what your wanting to do. The question is do you have a "vortec" or is it TBI. The vortec motor says vortec all over it (they were pretty proud of it I guess) The earlier TBI motor, at first glace look just like the old carburetor versions until you take of the air cleaner and find a throttle body instead of a carburetor. The two are not interchangeable as to the electronics, they are way diffract.
good idea, use 350 block,305 heads &intake.the reason is, if the 91 305 heads are 4 bolts in center of valve cover the are what you call vortec heads,they have better flow.the tbi will respond better &still have bettergas milage than old style heads.the 350 block will add more overall power.you shouldnt have any problems doing so,you will notice a diff.have fun, good luck.