Dear Miss Snark:
Thank you for helping so many writers. It is very kind of you. I have just finished a literary novel and I have a chance to have it read by two best-selling authors. This is a very important chance for me and I want to submit it to them correctly. Should I give it to them double or signal spaced? It is 125,000 words. Should it be bound or unbound?
Many thanks and best regards,
Um...are you giving it to them so they will blurb it?
So they will critque it?
What you want them to do has a significant impact on presentation choices.
If you want a critique you send manuscript pages just like you do to an agent. Observe standard form.
If you want a blurb, I always put it in "as close to book form" as possible. Typeset, bound, trimmed if I can, and actual galleys if I can do that too.
Make sure you include a cover sheet with your contact info.