adapting a Novel...

I'm currently adapting my Novel into a screenplay. The producer wants to see both the Novel and the script. Should I try to include as much from the book as possible, even if meant the script will run up to about 140 pages or should I make painful cuts and trim it down to 110-120 pgs...I feel I can weed out lots of long-winded dialogue stuff, even though I think it carries well in the Novel, I'm not so sure it would on screen...

Is this a trick question? Why are you even considering stuff (long winded dialogue) that you think may not work on the screen?

If you can cut characters, events, sub-plots, backstory, etc and still tell the protagonist's story - do it.

And don't stop at 110-12- pages. Keep cutting until there is no more to cut.

invest in some screenwriting books on adaptation
like: Screen Adaptation by Kenneth Portnoy
the styles of story execution are completely different

Remember that adaptation is a matter of reinvention. Be true to the spirit of your book but free in the way you turn it into a film.