Thanks everyone for the input. Looks like I may be stuck with the stock sensor assembly for now.

Snowtoy,
I was also looking to install the Jacobs ignition and wires as on your truck. Are you happy with the performance? Mine still has the stock ingnition with the small wires. I can tell it also needs help in this system to.

I don't have headers yet, but I did open the exhaust from the O2 sensor back with 2 1/2" pipe, magnaflow cat and muffler. It helped some but this motor obviously needs more flow.