My friend has a 1966 Satellite it has a Hemi fiberglass hood with the scoop.That car ran way off like 11.76,12.03,12.09 thin a 11.82.We were working on it and we was running out of time and didn't put the hood on and it ran 11.71,11.73 but mostly 11.72s lol He never run it with that hood again.It could be little things like that. Bentwheel43