727 or 904?

Ok cool. Do we know which parts we need to upgrade?
I have a trans guy but he doesn't build that much race / high hp stuff. I mentioned this site and he said to ask and see what we learn.
Appreciate everyones input ty

Cool, this one is easy- the 904 hands down. Now I myself can't be givin an exact $ number, but I'm to understand it to be around 6 hundred or so in extra heavy duty parts.