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http://superlift.com/tire_chart/chart.aspFender trim needed.
I think we talked about this before but did you off road or just drive it and there is 7" of tire difference between 42s ans 35 but your only talking about a 5 " difference in lift so I think those 2" will be a problem with your 73 k10 most people use 9" of lift just to fit 38s so if you want to do it cause your 73 was able to fit 35s with a 4" lift but what's the stock tire size? I think you can fit 31s stock so fitting 35 with a 4 " lift I can see it. But 42s I can't see that