Ghost, he didn't say it was a small block. I might be a 351C (big block). They were very powerful and respected back in the day. But there's no subsitute for cubic inches. 
That's something that was available in Mopar's to the extreme!
I agree the Cuda will get more looks like I said above since they are more rare and desireable. One thing about the Mach1 is the rear visibility is poor and the belt line is so high I feel like I'm in a coffin.
Speaking of high beltlines, the Cuda/Challenger definitely fall into that category! Even at 6'2", the door is a little high to hang elbow... But that reminds me of the first time I saw a Cuda convertible, and why I instantly resolved to own one someday...
17 years old, (a long time ago now!), and I pulled up to a stoplight right behind a '70 Cuda ragtop, black over hemi orange, and I remember the coolest thing about it WAS that aspect of it, that only the very top of the driver's head was visible from behind, because of the massive hips and ass on that thing! It was clearly bigger, wider, meaner, more laid back, just all around CRAZIER than anything I had seen before. Right then, I knew it was gonna be Mopar or no car!
I confess to liking the styling of various fastback Mustangs, but I gotta agree that they are less rare than big honkin' Cudas... Although it must be nice to be able to get so many repro parts that are hard to find for Cudas..... (trim and such).
