273 Commando or Not?

It has a 30 below AB 14" wheels no sway bar but came with 2 other K frames I will have to look at them.It came with 4 dashes some with gauges and some with out. I found the original build sheet under the back seat mostly chewed up but you could read 4.63 gear ratio 2 tone paint silver and black. There are holes in the fenders for the formula s emblems but no emblems. I bought the car as a grocery getter for my wife but as usual I have gone over and am know try to get it back to as close to original. I am attaching a couple pics

If you look at the upper part of the Build sheet you can see P4X = black interior and 30 in field 35 which indicate 273 x 2bbl. That is a proof that your car was built with that engine. However the Hustle stuff catalog that Chrysler came out with in September of 1964 included all the parts to build a car like a formula S. You could have the engine with all the godies incl the exhaust system , HD suspension, sure-grip etc. As chryslerfat mentioned you can check out your rear valance panel to see if there is a call out for the resonator. Good luck with your great project!