I know that its a 6 cylinder and I heard that adding AC to a 6 cylinder really pulls power form the engine.
QUOTE]
I've owned a few 6 cylinder Mustangs with factory air and it really doesn't pull any power from the engine. These have nice torque and to be honest I don't notice a diffrence when the AC is on other than I'm not sweating in the New Orleans heat and humidity. My current Diamond Green 67' with AC and Power Steering I'm using as a daily driver and it's still pretty peppy.
We had a 67 6cl coupe that had AC we used to go to MCA national shows. We put our boys in the back, filled the trunk, and ran 75 on the interstate no problem. I did use the Sanden replacement they are a lot more efficient. Marty