While I don't neccessarily agree with his list, it's a very good read nonetheless. Obviously, when it comes to opinions, one man's coffee is another man's tea.
My gripes, however trivial, are as follows:
1) A Cobra really is a sports car, not a muscle car....although we'd all love it if one magically appeared in our garage one day.
2) I don't know how you can come up with this list and not include the '70 Chevelle LS-6. Fans of the L-88 Corvette and 428 Cobra Jet Mustangs have a similliar beef, IMHO.
2.1) No '69 Malibus with a 307 and a Powerglide? C'mon........

3) The 1969 Z28 is a gorgeous car.....but I sometimes wonder about all praise the Chevy 302 and Ford Boss 302 get. On the track or the Trans Am circuit, they both rock. On the street, I would wager it's a differenet story. Both motors need to (and are quite capable of) pulling up to 7500 or 8000 RPM to achieve peak power. It's hard to keep a street car in the 6000 - 8000 RPM range.....even for TireSmoker. These motors just don't make that much torque down low and really need to be revved to "enjoy". Off the line or street light to street light, they would struggle somewhat against larger, torque-ier motors.
But, no one asked me for my list, so Bobby Rahal's will have to suffice for now.