You should be able to use a lot of the S-10 wiring. The light Fixtures will work with 12v bulbs, as will the 6 volt wiring to them, if they are in good shape. None of the electric motors like the heater fan or windshield wipers from the 33 would work, if it even had them. There are plenty of retrofit 12 volt units that will fit though. Will make it easier if you keep as much of the S-10 firewall as possible. Also regarding the steering, the 4.3 V-6 is basically a small block V-8 with 2 cylinders removed. So it is the same width as the V-8. I am not posiitve, but I don't think you need to do a lot with the steering. There are even headers made for the swap that get around the stock steering.

Pat