267 needs to be treated , like it was built.. : a torquey low compression engine .a 3.5 bore , and a 350 3.48 stroke. A buddy scored a free J.Y .one , for a '70 Nove .The car had a stock TH350 , and 3.08 out back. Slid in a 112 lobe center 218/224 at .050 " cam , a Street Performer Holley intake , a Holley 600 vac sec. It ran high to mid 14's on the G Tech , got low 20's in the m.p.g. department. No slouch.