Here'* some pics for u guys, hopefully it can generate some opinions and/or ideas on how you want your cold air intake built. I built this one for my 1994 buick lesabre with the series 1 3800. I used a 9 inch k&n cone, the air inlet duct from a series 2 3800, and some straight muffler piping from napa to extend the cone to the front, right behind the headlight. Sort of in the same place that the stock airbox took its air from.
The reason i used the series 2 inlet duct is because it has the IAT sensor built into it were it connects to the MAF duct, and since the IAT sensor on series 1 motors is built into the air box if u remove it,u remove the sensor and doing it this way by just extending the 2 wires, will send the most correct signal to the ecm, as seen in this pic.
close up of the IAT sensor relocation just to show it a little better
Hope it helps,