The VIN will have an 05 as the 3rd and 4th digits. All Mach 1's come with the deluxe interior and the 3 gauges in the center stack. I think the base engine for the '71 was the 2V Cleveland which is the letter "H" on the VIN. The more desirable engine is either the 4V Cleveland which is an "M" or the 429's and I can't remember their VIN codes. Mach 1's with the 4V Cleveland or better also got the competition suspension which included staggered rear shocks and a rear sway bar, both are easy to see under the rear of the car, especially the staggered rear shocks. Of course engines and interiors can change over the years but not the VIN. So if the VIN doesn't have the "05" it isn't a Mach 1. No exceptions.
the mach1 also came with a 302 if im not mistaken??? the top notch ones even if there a 351c 2v have deluxe door panels, rear spolier, fold down rear seat, center consol, and triple gauge package. not all of course came with such options... if the car has ram air then ur lucky ... i paid 3k for mine in good shape didnt run but im doing a frame up restore on it so didnt matter to me. i rebuilt the engine. but if it runs in good shape not to much body or interier work i would say no more than 5k cause it has no paint...would have to see pics to give a good aprassial
The interior was part of the Mach1 option, I dont have the book here, but the Mach option was 351, Deluxe int., Power steering cooler (if App.), Staggered rear shocks. All that good stuff. At least on 72's ram air was only availible on the 351 2v as an option, and standard on the R-code 351 H.O.