I could be wrong here, but on some (most? all?) Masseys with the CAV injector, there is a spring and lever under the top cover of the injector pump. The lever has holes along it's length to adjust for pump response for various engine sizes, and if the cover was taken off to replace the throttle and fuel shutoff rod O rings, it's possible that the spring didn't get put in the right hole on reassembly, which could cause the problems you are describing.
No, I don't know what hole is the right one for your engine, but I'm quite sure if you ask on the Massey forum, someone there would know.
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