Thought I'd provide a quick up date on this project for posterity...
Just got off the phone with Mantis. As you can see from the pictures below, the problem is that the bottom of the AOS is actually about 1/16" below the bottom of the engine. no problem for the stock pan, but this means that the windage tray does NOT fit flush. Mantis said "oh, you have an early engine, just cut a hole for the AOS". Well, no problem, i'll get right on that. Kind of a pain in the butt, and sort of un-does what the tray is suppose to do, no?
So, a little ticked off, but I'll cut the hole and do the test fit later this week. Hope to have this up and running by the weekend!!
Here is a picture of the AOS hanging down:
I had to make a template for where the AOS was, then transfer it to the windage tray:
Plan is to cut this out and get a reasonably close fit to minimize oil transfer via this hole:
