I do know that the Etruscans were engaged in several wars with the Syracusans, though some hundred years before EB's starting date. However, after the battle of Cumae in which a Etruscan fleet was completely destroyed, both Roma and the Samnites were awarded with large swathes of land. I guess that the Samnites would once again help the Syracusans should they emerge as the largest empire in Italy.