Thanks again for great information, Jeff.
Regarding my last question about the engine size being a decal in the stripe, or an emblem on the scoop (or none of the above), I may have mixed 69 and 70.
It is 1970 that I'm most interested in and particularly how Mach 1's with a shaker and a 351 engine came from the factory. I thought I'd attach some pictures of 1970 Mustangs with shaker hood scoops. Not all the pictures are Mach 1's.
In the first pic, you'll see the 428 is a decal in the stripe. The second, the scoop has a Cobra Jet emblem but no engine size. In the third, the 351 is a decal and the scoop is bare. Lastly, in the fourth the scoop has a 351 emblem and there is no decal in the stripe.
So to refine my earlier question, what would a 1970 Mach 1 with a shaker and a 351 look like?
Many thanks.
Bongoman