There is no way you are running under 9.90s with anything close to stock flowing heads/intake/exhaust. I'm talking near stock compression and head configs. I currently have a very nice running 440 with a small upgrade in cam (but still hydraulic with stock 452s on just a bench port job.) Old Edelbrock Performer and Holley 750 in a 3600lb GTX. I would be happy with mid 13s.