Grumman AA-5 may have entered Class C while experiencing a NMAC with another aircraft.

Narrative

As I was flying in an easterly direction approaching the Santa Ana Canyon; where Highway 91 and the 241 Tollroad intersect; I saw a Mooney to my right side traveling in a southwest direction away from me. The Mooney was at least 1;000 FT lower than my altitude at this time. I looked for other aircraft in my vicinity; then looked back at the Mooney and saw it in a climbing right turn; traveling much faster than me. I watched the Mooney continue its turn for several seconds; but could not spot the Mooney. As I was about to announce on Corona's CTAF that I was approaching Prado Dam; I suddenly saw the Mooney appear from under my left wing. The Mooney was on the same heading as me; less than 50 FT below my wing and its horizontal axis was about 10 FT left of mine. It was traveling much faster than me; still climbing; and moving across my path from left to right as it turned southeast alongside the mountains. As the incident developed; all my attention was diverted to the Mooney; and not knowing what it was going to do next; I kept a continuous watch on it as long as possible. As a result; I failed to keep track of my aircraft's position relative to the Class C airspace before I turned southeast; and may have drifted into controlled airspace. I then continued my flight.