I would think you should be in the 12's also. Depending on your gears and tires. I have a 78 Malibu with a 355, vortec heads (2.02/1.60 valves), air gap intake, headers, 2-1/2 inch dynomax race mfflers, 670 street avenger, and 342 gears. I think that's it. I run a pretty consistant 13.5-13.7. So...