I used to own 457 and the only starting/running problem I had was probably fuel vapourization
when starting the car on a very hot day, after it had been left for 5/10 mins when engine was already hot.
When I had no. 50 I had two running problems.
One was, as Big Russ said, a split in a breather hose (I think it went across the top of the engine and had foam around it).
The other was dampness on the rubber boot part of the coil pack and around the sparkplug.
I think it was plug no.8 (at the rear on the nearside).
You would need to remove the coilpack to see the dampness, and see if the sparkplug has any rust on it.
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