Thanks everybody. So it has a correct interior and it is a probably a 429. Two things still bother me though. The twins clocks thing is wierd. I would have thought it should be a tach in the dash instead.
Like I said, it was most likely a 'speedo/clock' car and the owner has found a full console with clock to install - it's not THAT uncommon. This is exactly what's currently going on with mine, mostly because I've been too lazy to get my speedo/clock instrument cluster to The Rktmn for one of his awesome tach conversions. My '71 H-code came with a speedo/clock cluster and didn't even have a small trim console or anything around the shifter (just the shifter bezel bolted to the floor) - awhile back I scored a great center console on ebay to help complete the interior options when it all goes back together.
Changing over to a factory tach cluster is more involved than just swapping out the cluster - the wiring harness must be swapped as well, or some creative rewiring will be involved to make it work. I only discovered this after purchasing a complete wiring harness and tach cluster, only to find out it was from a '73 (and would not work in my '71). Through this site, I also learned that the tach conversion The Rktmn performs will be well worth it, compared to the crazy Redneck-engineered wiring acrobatics required just to make the factory tach work with a non-factory tach harness.
Eric the thing that troubles me is the car has the three guages in the center console. From what I have read if you ordered the instrumentation group it came with the Tach, trip odometer and triple instrumentation pod.
This car has the triple pod so why didn't it come with the tach?
If you look closely at the clock console bezel it doesn't color match to the rest of the console. What I suspect is what you said, the bezel was replaced and at that time a lower clock was added.
I also read that the woodgrain bezel for the center console only came on very early in the production of 71 models. Unless this car is a very early model maybe the center console with the triple guage setup was added too, but I thought the triple guage pod was standard on all Mach 1 models.
I'm going to call the dealer today and get some more info and will report back here.