What's the difference?
I'm not sure when EGR came into effect for all the US, but the first couple of years Mopar implemented EGR, there WAS NO actual control valve. You can only "tell" an early EGR equipped manifold by looking down to the floor of the intake through the carb mount. Ma simply "drilled some holes" in the bottom of the intake, allowing exhaust from the crossover to leak into the intake area.
Later ones, of course, had the obvious EGR valve on the rear corner.
http://www.forabodiesonly.com/mopar/showthread.php?t=162760
This drawing is out of the 72 shop manual
I'm not sure when EGR came into effect for all the US, but the first couple of years Mopar implemented EGR, there WAS NO actual control valve. You can only "tell" an early EGR equipped manifold by looking down to the floor of the intake through the carb mount. Ma simply "drilled some holes" in the bottom of the intake, allowing exhaust from the crossover to leak into the intake area.
Later ones, of course, had the obvious EGR valve on the rear corner.
http://www.forabodiesonly.com/mopar/showthread.php?t=162760
This drawing is out of the 72 shop manual