1990 GMC 4x4 Tbi 350

[gmservice]

I Called Comp Cams today because I wanted to put a camshaft into my truck that has little duration, small lift and 108 degree lobe separation. They told me that I couldn't do it because my computer is not capable of being programmed to handle any cam but a stock one....are they right?????

I don't want to go with a carb.