Oh I miss read your question, ( I read pretty fast). No we never bothered with cores on the rad, we wanted a bigger rad for increase cooling efficiency. The tank is I believe an original steel somewhat square tank, that wasn't in too bad of shape. We put a handful of small sized slag (byproduct of the mine in town), and shook it to death then cleaned with varasol a few times.
Yes its carbed engine, we haven't really had any fuel delivery problems that we could notice, actually I think I stalled it once when I spun out on a steep hill. I suppose fuel injection would have prevented that. We did think about converting ours to fuel injection, but we decided that staying simple with a carb might be more reliable. But if the motor already has it, I would hesitate using it in a bomber.
