Well, I can't answer that at this time, I haven't used a chip at all. I'm hoping that one straighten everything out on my car. What all did you have to change to put the 351 in your car? I was thinking of building another car with a 351. Are you running any accesories at all? The guys told me that even if I change the mass air after they burn me a chip, that it would effect the programing. 
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347, Edelbrock Performers w/ 1.90/1.60 ported and polished, Comp-cam---.533/.544, GT-40 intake, 38# injectors, long tubes, Vortech S-Trim and all the other usuall stuff.
Last time at track: 11.49 @ 122.4 with a 1.68 60 ft.
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