This is a rather circuitous route..., but there is a guy from France, working on a Cortina 1600, asking on the Studebaker site for advice. He has a proper bearing insertion tool that closely fits the bearing with shoulders. He says it goes well but eventually the bearing distorts and the cam doesn't fit. He has gone through three sets of bearings without getting them installed so as to have the cam fit.
Is there anything specific to this installation? On his behalf, thanks for any advise.