I have been doing a bunch of research and reading when it comes to EFI systems. Its up to me to make my final decision.

Its down to two systems
Holly EFI
Fast EFI 2.0

they both have pros and cons but I really like the Fast only because of the e85 capability. I have read with fast you will need a different o2 and that is fine with me.

the holly requires a different fuel table and that really scares me if I botch it up on the initial setup. it scares me because I have never sat in front of a laptop and changed fuel curves, for some its very easy for others no so much.

what it all comes down to is me making my decision.

Now for the real question I have, and sorry for it being a stupid one.

If I run one of the two efi systems will I still need to run race fuel or a fuel of 100 plus octane, can the system learn a lesser octane and compensate without spark knock?

I only want to spend the money once. but I am getting very excited about efi the more research I do.

any and all comments are welcome, and if there is a different system out there that someone has used with real experience

Kiddart