Bought this '64 2-dr post locally in Maryland in the mid 90's. It was a 283/powerglide, bone stock.
Over the years I installed a 350 motor and a TH350. Also installed a 12 bolt from a donor 1965 El-Camino; i think it had 3.73's in it. Fastest it ever ran at the track was 13 flat. Not terribly fast but I learned a lot working on this car. Here's a link of me racing it at 75/80 in July 2000. I sold a few years later to a guy in Hagerstown MD. Used the money to buy my '64 El Camino.