Hi Bill,
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To answer your question, just take the V2 board out and install the V3 board in it's place. They are basically identical boards, the V3 board having IRF510s for finals instead of the original IRFZ24Ns. The V3 board also has the clamping diodes across the gates of the IRF510s to protect them from voltage spikes blowing them up, other than that there isn't much difference. I upgraded my V2 board to a V3, I then modified my V2 board and i keep it as a spare but have never needed it.
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Joel
N6ALT
Joel Caulkins/N6ALT