Yes, yes it is a flat top. However it is a D7 not a D8 and I don't remember if it was a BA or a AB. That part is ground off.
That picture is out of our Falcon SIX Performance Handbook too (page 6).
If you note the little arrow pointing to the bolt hole. Those two holes are the original carb mount stud holes. When I elongated the manifold after machining it flat, I left BOTH of the stud's threads intact and with enough meat not to break. I also left about 1/8 flat gasket surface around the outer edge of the log for adequate gasket seal. Because of leaving the stud holes intact, the elongated hole in this head is smaller than the head directly above it. It was also considerably cheaper to do.
I made a gasket out of a Wheaties (Breakfast of Champions) box and put plenty of sealer on it.
The blue log manifold above it is a "hex" log. The inside and outside edges had to be welded up to form a flat surface. The stock attaching bolt holes were ground away during the elongating process. After this picture was snapped, new attaching holes (for the adapter plate) were drilled and tapped. That welding, drilling, and tapping took more time - and more time means more money.
If you've got Adobe Photoshop (or similar program), right click on the pictures and save them. Then you can reopen them with Adobe and enlarge them. It's much easier to see what is in them.
Nope, I don't have any extra adapters lying around. Dave and I haven't gotten into the parts end at all. This is a piece that AL on the transmission thread could easily make.
Mill your log flat. Elongate your manifold. Go to any machine shop and ask if they have 1/2 inch Alum. bar stock about 3 1/5 inches wide. Get a piece about 6 inches long. (Measure the base of your carb first) ( I took a carb gasket with me and got a half price piece out of the scrape pile)
Cut the plate to the shape of the carb base. You can use a saber saw. Drill and tap the four carb stud holes. Put a phenolic (spelling?) insulator and the carb onto the alum. plate and put your valve cover on. Now test fit the carb and plate to your log for clearance to the valve cover. Put several locater marks on both the plate and manifold to index where your homemade gasket will go on to the plate.
Locate the gasket on the plate and scribe the elongated hole on the plate. I drilled about 30 1/8 inch holes about an 1/8 in inside the elongated circle. I then used a saber saw to finish making the hole. When that piece fell out of the adapter. I put a carb gasket on the other side and scribed its hole. (I used a knife to cut out the gasket's bridge between the two carb bores so I had a big oval.) I then used a Dremel to taper and blend the two hole shapes together. You could also use a drill and grinding bits. (FYI - the more expensive of a bit you buy, the better they cut and the longer they last.)
Good luck.
