My mechanic would have a fit, if he saw the size of your carb. I run a 750 Demon on my 306, and an Edelbrock 750 on one I just sold. With the porting you have done a 750 should be no problem, and pick up some HP at the same time. If you do decide on something like a Demon, call them and tell them your set-up, and get a prelim. jet sizing and cam spec. I would suggest some Dyno time, to get it really dialed in.
Ron
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