My 87 4x4 suburban is fuel injected, stock, and I have pulled quite a few things that were heavy. Including my 69 on a full trailer from Chicago to my house, all in stop and go traffic. about a 2 hour trip. It performed great! I don't have to do much maitance. It has 161,00 miles and is my daily driver. The only time it ran bad for me was when it needed a EGR valve.
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http://hometown.aol.com/racedvl/racedvl69index.html
Crystal Lake IL. 30 Miles north of Chicago