ok first question, is the 84 a z28h.o. with the l69 305? If so that is the best production 305 ever made. Corvette spec performance in a 305. special heads, cam, and carb. As for the swap itself, since it is a 94 the v8 option was a lt1, which is the same mounts as the 305. Change the frame mounts and get the lt1 motor mounts. When the time comes to swap the engine, lift the car up and unbolt the subframe and install the motor from the bottom.
As for as the ignition is concerned, your best bet is a hard wire with toggle switches and most likely a push button starter. Now for the full system you will need to either change out the intake pump for a smaller less output pump, or just take the pump out completely and run a mechanical pump on the block.