Engine ID? Anybody Recognize This Critter?

[El Jay]

This just to appease my curiosity:

Somehow, or another, I lost the background info on this engine, but not the picture; here's what's bouncing around in my failing memory:
265 C.I., SBC, converted to OHC
Run in a "local" circle track car in the Midwest, maybe (?)
And I want to say that the owner routinely changed it from OHC to push rod, and back to OHC depending upon the track rules where he was racing.

Any info on who raced it and where and any other particulars would be greatly appreciated.

Thanx
Larry