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the grinding on 3/4 tons is because of the caliper bracket, not necessarily the caliper itself. if you bring the bracket size down real tight to the rotor you dont grind as much.
and 3/4 ton and 1/2 ton front calipers are dimensionally identical, but the 3/4 ton version is supposed to be better. and yes you can put a 3/4 caliper on a 1/2 ton truck.
i also like this because you have four identical calipers if you do rear discs.
im also getting ready to do this conversion. lots of great info. thanks guys. i do have one question, mine has 13in drums. will the k5 brake booster and master cylinder be ok with the 3/4 ton brakes?