66 I would not be so quick. That "looks" like at least three setups I've seen for A bodies, two of which appeared right here. That crossover pipe goes down and right in front of the K, behind the rad
"topfueldart"
This one, very similar
http://www.forabodiesonly.com/mopar/showthread.php?t=227729
Good photos start post #50
crossover
exhaust