Is there anything stamped into the end of the camshaft? The T3 camshafts were stamped with T3, I do not know about the earlier 200 or 220 camshafts. Can you post a picture of it? Can you put up a picture of your cylinder heads especially the roller rockers and the combustion chambers. That will help me ID your engine.

Have you replaced the conrods? Or just the pistons?