Greetings, I'd like to re-jet my rochester monojet for altitude but I can not find here on anywhere the size of the factory jet. I live in Denver and as far as I can tell folks suggest buying 2-3 jets a few sizes smaller. I know where to access the size inside the carb, but the car is running and driving and I'd rather not take her down and out of commission for that long. She runs pretty well, but is very obviously not jetted for Denver, and I intend to take it up over the passes around Colorado. The engine is in a '69 GMC with a 250 and as far as I can tell it's original. The car/engine was originally sent to Montana, if that helps. I'm sorry for the noob question, but the information I've found has been all over the place and I either suck at navigating the search or haven't found a bench march size in the threads that discuss this. Thank you.
-Nate