That may be an engine custom assembled by engine builder Clarence Lee. It is a very potent engine and if in good condition could have a high value. It also has a Perry carburetor on it which is a great carb although it can be tricky to tune to a newcomer. It is an engine more suited to racing. Mr lee used to write a column for RCM magazine and now writes for another magazine. He was the designer of many engines by Veco and K&B. The parts of your engine (unless tampered with since new) were hand selected and assembled by Mr. Lee to perform to optimum for that engine.

Good motor.

BTW - It's referred to as a "Lee Custom"