i would be tempted to just swap the front cores in this case and make the bumper mounts
but splitting the difference at the cab rails is where i usually do this. i use to pull them all but just split the line at the cab horns now.
things i noticed from the various gens is the plastics all have slightly different mounting setups.
least amount of drilling will be to split it at the cab horns and carefully cut the inner fendr rail
when i first started doing that i took the whole assembly to the a piller but after installing some tilts and the time it takes to have all the bolts in place i find it much more effective to split them right at the cab horn. i have to mention this weakens the assembly to some degree in a crash situation, how much i wouldnt know or care to personally, but i hit lots of deer and mine has not even been bolted on through the sides in 3 years, just pins on and lifts off when the occasion for maintenance to the engine arises...like tomorrows hydroboost/steering revamp. real nice working on crap with room like this with a big v8 in the bay.
this will only leave you in need of making the front mounts work and the custom bumper brackets....and i am sure a few other minor irritations to deal with.
obviously i am not a looks guy so body work is not really something i should even give advice on
but thats what i got for ya..
on edit here.
the engine in the truck in this picture...
IS NOT A BIG V8 obviously