If it were me. I would either leave it alone and install as is, or go all the way with a rebuild / stroker kit / aftermarket heads etc.

Is there something wrong with the factory EFI? Besides it not being pretty. The factory EFI seems to be the most dependable. Though, I haven't heard of any Fitech failures. But out of the two people that I know that have it, one loves it, one hates it.

If you start changing things, one thing leads to the next, and the next, and the next.