Given that you are in Italy with high priced fuel, have you given thought of destroking the 455?
Rocky Rotella mentions in his excellent Trans Am book the 366; a NASCAR qualified 6 liter in the early 70's.
Pontiac engineering made a few test motors in street form, using round port heads. They found that they hit a "sweet spot", it had the same torque and more power than a 400 but sales squashed it. This motor had a 3.375 stroke and large bore - 4.180" so a 455 would be a natch for this.
Issue of course is the crank - it would take some work to make one work - perhaps a 428 unit with custom rods?
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