Port match

Its a 340 with Eddy heads and a M1 duel plane, the headers are Headman Tight tubs. I have the valve covers off right now to change the rocker arms to rollers, and the headers are off because of a small leak on one end of each. I was just wondering, should I take the intake off and gasket match it to the heads as well as gasket matching the headers. I know this will improve flow but is it worth the work? How far off could they be as cast?

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