I am looking at these heads on ebay. I am considering putting putting them on my 350 w/flat top pistons comp 270 cam in my 67. I want to replace the 441's that are on it now. Any experience out there with them? The price seems right. I don't want anything with too big of ports so there is no low end. But I may build up another short block that I could bolt them on to that would run higher then the short block I have.