Joe:
That isn't the case up here in the DFW area. Someone had mentioned Grainger was doing something similar.

                                                                                            -Keith

I love dealing with Fed Ex. in 20 years they have never lost a single shipment. Of course, I get a good discount being it's interline shipping.  I had a block shipped to me from the Pacific North West. Three days to my door. 262.00. 
I know some of you followed my Yellow Freight Ordeal last year. JOY!

I sure do!

The SE version of my heads will fit shock tower cars and any headers that will fit a 427 or 428CJ exhaust port.

Jay, would there be a notable difference in power over the Edelbrocks?

I have a D4TE service block mirror 105 with no ribs too that is a 428 block. 

The export brace is even more critical on 67- 68 cars. They lack the tower reinforcement that the 68 1/2 CJ-69-70 vehicles have. Shelby realized the issue and there did some horrid stitch welding around the plates.  When I restored my Shelby I welded all the way around and cleaned the welds post.
I didn't see much for bolt-on frame stiffeners that didn't cause ground clearance issues. I make enough power to justify them, but I can't weld them on my vehicle.

Jay, what headers work with your heads? Will they work on a shock tower car without custom made headers?

                                                                                                                 -Keith

I had them years ago. C2SE-6090-C They had spring seats like the 427 heads. They were off a tri-power 406. they were 64CC chambers
I hope that's helpful.

You may be right on the Mustang. They seem to work great on the small block cars except for certain header combinations.

                                                                                                 -Keith