A very nice shot of the original Mach I, EM. It is - indeed - a '69 and looks just like my '69 Mach other than the color (mine was green) and the rear wing (an option I didn't have). The '69 was available with Windsor 351s having 250 (2V) and - I believe - 290 (4V) HP, the 320-HP 390 that the pictured car appears to have, and the 428 and 428 Cobra Jet, both of which were rated (or underrated) at something like 330 or 335 HP. In '70, the 4-barrel Windsor 351 was replaced with the new Cleveland 351 which made at least 300 HP; the 390 was dropped from the option list.
I bought my Mach I - which made due with the 2V-351 - in March of '69 and drove it until June of '71, when I jumped ship and traded it for a new Camaro.
Jer