Power distribution is all different with the DOHC engine....off the line a modified Series II L67 will quickly lay waste to the 4.0. However it not meant to be gruntish off the line, its got smooth evenly distributed power.
I find my 4.0 is more of a pleasure to drive then the 3800, its quieter, the tranmission shifts nicer. Its a lux car thru and thru.
At the end of the day, I'm pretty lucky to have both powerplants.
Keep enjoying your Bonneville there Andrew
Oh Jerry, if the weather is nice, we'll bust er out.