Question about carbs for tunnel rams

hi guys, finally fired up the engine today after fitting alloy heads and tunnel ram with the 2 x 500 Eddy's, but its idling too high, setting the timing to where it was originally makes it idle around 1200 rpm and the idle screws are out all the way, im going to have another look tomorrow to see if i can make some more adjustments, but im thinking a possible vacuum leak? Couldn't see anything obvious though. If anyone wants to throw some suggestions my way it's greatly appreciated thanks.

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