I don't have blow-by on my 03 so don't really need a catch can, but the way I have done them in the past was to install them inline with whatever line that was the crank case vent. On the 03 there is a hose from the oil fill Tube to the air inlet pipe (CAI) feeding the TB. If I was to install a catch can on the old girl that is where I would put it. Often you see this vent hose simply vented to atmosphere with a small filter on the end of the hose, with the Air tube side plugged. This would keep the TB from sucking hot gases from the engine into the air inlet tube. The COPO thread has some excellent pictures of a racing vent setup. With vent hoses coming from the valve covers to a catch can with a atmospheric vent (small filter). Venting the crank case reduces pumping pressures, how you do it may or may not need a oil control strategy. I don't know about the 03 if it would benefit from additional venting. A lot of the old racers also used header scavenger setups to pull a vacuum on the crank case to reduce pressures and help seal rings. However changing any of this is illegal on a street vehicle for whatever that is worth.
