that SC cover is different than the Bonnes

You're right. It says 3800 V6 instead of just 3800. Never seen one of those before.

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I think the Grand National motors were based on the early oddfire 3.8'* of old that powered the RWD cars in the late 70'* and early 80'*. I'm 90% sure the firing order and accesorys were different at least and I thought that other than displacment the oddfire and evenfire (FWD cars) were, other than displacement, different. Correct me if I'm wrong though.

here'* the page from the '95 GM powertrain guide on the different 3800 series engines available that year

I had a 1985 Park Avenue with the 3800 n/a. The basic engine has been around for a long time.

The Grand National block is very closely related to ours. We're direct descendants of that motor.

I think somebody here or on another site I frequent found information about the history of how the 3.8 came about. I guess it started in 1962 with the (225? Same as early 60'* Jeeps) V-6 (Buick'* V-8 minus 2 cylinders) and when the V-8 got bigger so did the V-6 to 231 and it gradually evolved into what we have today. Pretty interesting!

That 92' Ultra ran a 15.6.

You don't know the track conditions, temps, and have to keep in mind that the 92 ultra didn't have the roller valvetrain. There are alot more little differences between the 92 and 93 than most people realize. Including the transmission.