273 2v with EGR valve???
I bet it's a whole different engine. Probably a later model 318.
EDIT. I posted this and missed where you said it IS a 273.
About the place in Fairmont. That's Frank Mitchell. I've dealt with him a few times. Never had a problem. He is however really high on some things. That said, it's usually old NOS stuff you caint find just anywhere. He has the stuff, no doubt about it.