I had the same cylinder and really was not happy with the power it made. I sent it to bubba ramsey and wow what a difference!
This is what I've decided to do with my 330 for now and I'm going to build a new complete 350 over the next year. I spoke with bubba yesterday and he seems like a good guy. He's going to port my 330 and fit a new piston as well as cut a custom dome for me. I can't wait to get it back and feel the difference