Advancing Valve Timing

2 degrees isn't much so I wouldn't think it would be a problem but having said that I'm not sure on a 273 and i would be asking the same question, are you looking for more torque?
Below from Comp Cams site

Advancing Retarding
Begins Intake Event Sooner Delays Intake Closing Event
Open Intake Valve Sooner Keeps Intake Valve Open Later
Builds More Low-End Torque Builds More High-RPM Power
Decrease Piston-Intake Valve Clearance Increase Piston-Intake Valve Clearance
Increase Piston-Exhaust Valve Clearance Decrease Piston-Exhaust Valve Clearance