Your 6.5 power valve is gonna open when your in gear...I'd drop it down to a 4.5 max...I'd start by adding more intial timing 17-20 degrees as long as the starter will take it...Limit the total to 36 degrees...Does it respond to the mixture screws? If not you may need to drill small (1/16-3/32) holes in the throttle plates to allow the idle adjustment to be closed enought to expose the idle transfer slot....