So it's .030" over standard bore. If you want to look under a valve cover you'll find a casting number on the head like 209 or 781. That will indicate the valve size and chamber size so we can at least get an idea of its potential. What do you have for the intake manifold and carb? Do you have headers (likely) and if so what's the diameter of the tube? Exhaust pipe size? Anything else that comes to mind?