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I have done this swap in my '89 S10 and I have to say that actually hooking up everything isn't that hard. I had a lot of other problems in my S10- but they aren't made to fit a small block like a fullsize is.
One thing I have to point out is that I don't think the ECM's are the same. I know in S10s the 4.3 ECM ends in xxxx1062- is the model #. The 350 ECM ends in 1147 or something-I don't have one in front of me. I tried putting my 350 prom in my 4.3 ECM-it doesn't work. Maybe the ECM's in 4.3 full sizes are differnent from S10's, I could be wrong.
The nice thing about the swap is minor tweaks are all that is needed to hook up all engine accessories, hoses and wiring harness.
Also I don't know why you will need to change radiators- you should be fine. Mine cooled fine with a 4.3 radiator- which is much narrower with than one in a fullsize.
Just a few thoughts...
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