Surging is almost always caused by a too lean mixture, be it a simple adjustment, a clogged passage, or vacuum leak.
All the governor wants to do is hold the selected RPM, it doesn't think about what it's doing, it just modulates the throttle plate position.
See if a partial choke will stop the surging. If so try adjusting the idle mix. If it doesn't help or has no effect, there is likely a clogged passage in the carb.
If this is a Holley carb, consider trading it for a rebuilt Zenith or MS, whatever the alternative was for that model. The Holleys were very troublesome on those.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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