This is pretty close to me so I went and took at look at it today. It's exactly what is described, basically a pretty solid frame with some pitting, mostly in the rear area where most of them get it. I know it's out of a `64 Cutlass convertible but might be the same frame as an early Gran Sport o No: http://www.ebay.com/itm/271169527959?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
it works, looks like a good piece...never get anything that good around here and if there was it would be so expensive no one could afford it.