It's a 273 auto floor shift car. It came to me with a rebuilt 273 supposedly upgraded to commando specs (it has the correct 4 barrel intake and a 500CFM edelbroack carb on it).
If it was upgraded to Commando specs it will have the domed pistons, a somewhat hotter cam and a dual point distributor. That fender mounted vacuum reservoir is a good indication it was equipped with OEM power brakes!
