as far as jets go and the carbs that you are using, and the setup on the motor, i would start with 78's and 80's, I run the 750 carbs and those are the jets i found to be best for the set up i have, I am running more hp, and a more ci but thats a start for you!
I ran a pair of 660's on a 496 with 82's ( non jetted rear plates) and it ran well to 6200rpm. Sounds like this would be a good starting place(78-80 range)