Well I was reading some specs on a new Intake Manifold and is said designed for engines without EGR

What is it and how do I know if my engine has it or not?

 

Exhaust Gas Recirculation: And I believe that the 67 did not have anything but Positive Crankcase Ventilation. The hose that runs from the valve cover to the carb.

 

EGR,,, one of my favorite emission control devices,,, (not).

EGR, or Exhaust Gas Recirculation, is where a (significant) portion of the engine exhaust is diverted back into the intake of an engine.

This is done to reduce the creation of NOx (mono nitrogen oxides). The introduction of the exhaust gasses cools the combustion temperature enough to curb or reduce the NOx emissions of an engine. http://en.wikipedia.org/wiki/NOx

By using an intake manifold that is designed for "engines without EGR", no matter the original design of the engine, it becomes an engine "without EGR" because this manifold will effectively block the EGR passages. There may be a "butterfly valve" in the upstream exhaust that may need to be removed to complete the conversion as well, but this is a small issue.

Does my answer seemslanted one way or the other in regard to your manifold selection? (ie: EGR use)

I do not know if EGR was used on classic Mustangs of certain years or not, your car may or may not have been equipped with EGR....

 

egr is more of a fox body thing

 

EGR is a joke. Never ever use it. ever.