Yup, that was one hell of a first post! We can tell, Mike, that this isn't your first Pineapple Round Up, and it looks like you're having a lot of fun making your car new again. You've done a remarkable amount of work in a few, short months. Not everyone on here has a paint-shop dolly kicking around to put the body on while you're working on it!
My guess on your engine HP would be in the vicinity of 85 - 90 honest hp at the crank. Yes, the head ports sound pretty stock if they look round. I have a pair of 044 heads which I had further-massaged by a guy who runs a racing motorcycle machine shop. The ports are now "D" shaped and really flow, but there is precious little meat between ports (1/8") so I've abandoned the head-to-manifold gaskets, sanded the manifold flange faces flat and just use a Locktite flange sealant on them. Seems to do the trick.
You are very brave to use an angle grinder on those louver openings. My first reach would have been for the Dremel and then with a very steady hand!
I also applaud your work on the Fuchs. I did the same to my set and it took about 4 part-time days each to get them sanded, polished and painted.
Anyway, great work there, Mike, and I'm sure you'll find lots of outlaw inspiration on here from the sublime to the radical. Pro'bly lots of labor offers from the mainlanders, too, as the winter wears on. Keep pluggin' away at it and keep posting results. You're building a great little car that your wife won't need power steering to drive.
Gordon - The Speedstah Guy from Massachusetts