I have been working on a 67" chevelle for some time now. I initially wanted to use the 350 small block that I built, but have decided that a 427 would be much more nastaligic. My problem is that I am ignorant about the 427. Are all 427's the same? or are there some differences? I have never built a Rat motor so I am doubly ignorant. Can you give me the best componants to install? And why? Also, what are the deferences between oval and rectangle port heads? thanks.