Thanks to all for the responses.
I found and purchased a set of 28", 28 gauge Full/Mod barrels. They fit like a glove with no adjustment necessary.
Not wanting to incur the wrath of the Parker Gods, yet always one whom enjoys flirting with disaster, I've decided since this is a totally aftermarket venture I'm going to open the chokes on my mis-serialized bastard barrels. I'm thinking Improved Skeet (.007) Lt. Mod (.013). If my math is correct, I believe I'm close to WS1/WS2. I'm predominately a Skeet shooter so they're a little tight but thought of the versatility for Quail over dogs.
How far off the mark am I in the numbers department?
Thanks as always,
Bobby