OK, just thought I might save someone a costly project. We turned the governor up on the "Sreamin' Jimmies" back in the '70's and '80's, loaded at 80,000 lbs every night coming out of the brew house in Columbus and back to Michigan. We could hit 3400-3600 RPM on those, took a little gettin' used to the slow turning Cummins but cubic inches and the long stroke way made up the difference. I made some repairs on the city route trucks, those were gas 366 and 427 with Holley 4 bbl and the same basic governor as yours. I didn't dare turn those up 'cus the city drivers would have scattered the engine.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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