I see neither an advantage nor disadvantage to an Amerisport GT5-S. The car was built in Modena and shipped to Kirk without engine or gearbox. He installed a smog-compliant engine and ZF. Not much else different between a Euro-GT5-S and an Amerisport GT5-S.
30 years later, the engine configuration is probably somewhat changed from the smog engine of the 80's so it is even more moot.
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