I don't think either of the PN's you listed are what you need, they both seem like rebuild gasket kits.
You need a new control lever assembly PN. CU 8514A , item 14 in the Ambac pump diagram. This will come with the external o-ring on it.
When the throttle lever leaks around the shaft it's the seal inside the control lever, which is non-serviceable because the lever is assembled then the end is welded on.
You don't need to take anything else apart to change the control lever, so none of the other gaskets are needed at this point.