I have a built 440, that I am using a Holley 750 D/P. I had everything setup just right when i lived in Oregon state. The elevation there was 4000 feet above sea level. I have since move to flatland ( Illinois) and the elevation is is aprox 250 above sea level. A difference of 3750 feet. The car now runs BAD! I asked you all about it, and was told that it will need to be Re-jetted to the lower altitude. Ok , sounds good to me, but now my question is, what jet size do I need to install. Im not sure what jets are in it now, but they worked very well at the higher elevation.I guess I need to install smaller jets??? Help.... thanx in advance. scott