My impression is that Rusty 1st objective is he would like for the oil temps to be lower. You're very perceptive :-)  Thanks very much to all for the comments.  After looking at my drawing some more, and comparing it to the pics of the cowl, I can see that I wasn't quite as accurate as I could have been.  Primarily, the core isn't parallel to the incoming air as the drawing showed.  I'll attach some actual photos of the scoop, to give a better idea.  They've been compacted, and enhanced a bit to make the details show up better.  Kinda hard to see much contrast in that poop colored epoxy.  I was never quite happy about the way I left that flat wall in the rear end of the scoop, and I almost smoothed it out a month or so ago.  What I was planning to do, is very much like what Ed showed in his blue markings.  I would never have thought to include any sort of divider.  From what I've seen, I think I'll probably smooth out the rear of the scoop first, and see what that gets me.  I can add a divider if needed later.  When I have the cowl off, I can place some thermocouples around the core to see what the delta T is.  One other thing I should note- the exit side of the core is pretty ugly.  Unfortunately, to get it in the stock cowl, I had to leave only a few inches for air between the core, and the oil pan.  I'm sure that's not helping me any.  The only fix to this is to reposition the core, which will be far more hassle.  Hopefully, I can compensate with the scoop shape.  Thanks again for all the comments.
Rusty (currently raining)