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gs1000 large port head vs small port

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    gs1000 large port head vs small port

    hello to all i am getting ready to do the top end on my 1979 gs1000 .
    it has the small port head with the 26 VM mikunis with a stage 3 jet kit kerker header dyna iggy and K and N filter pods. i just got a reworked head from a 1981 gs1000g with the large ports all ready shimmed and ready to bolt on .
    i also have a set of 34 mikuni cv carbs ready to go.
    How much of a performance gain will i see if i were to use the big port head and 34 carbs . i plan on upgrading cams in the not to distant future what would be a good cam to start with ?
    any info appreciated
    steve
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