Some thoughts:

- A short water pump is absolutely essential. That gains 1-5/16"
- I have had little luck with flex fans If you use one, you need a good radiator shroud.
- Most electric fans are a little over 4" thick. I'd choose an electric over an engine mounted fan every day.
- Don't depend on measurements from us. Have the fan, the body and the radiator mounted. Mock it all up. Otherwise, you're guaranteed to have to re-do it all.