My temporary shaft was a good bit smaller than the pump shaft. The effect of this was that I did get scary amount of oil coming out around the shaft, I think partly because only a relatively short section of the pump shaft sits in the bush and partly because the oil feed hole in that bush sits above the top of the pump shaft and the smaller temporary shaft was doing nothing to restrict the flow as would normally be the case.
In spite of this I did get oil pressure (as measured at the standard location for the pressure switch) pretty rapidly although only 20 - 30psi. I didn't hold out for oil coming through to the rockers - the feed is metered via flats on the rear journal of the cam so you wouldn't necessarily get anything much coming through with the cam stationary.
I then fitted the pump drive gear etc and spun the engine briefly on the starter which gave me 50 psi more or less immediately.
Engine has now done 150 miles or so and gets 35psi at 700 rpm idle even when properly hot and 60 psi @ 2000 rpm - so I'm happy with that.
Good luck!
Nick
I
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