Probably the most efficient ratio of performance increase to investment would be to add a turbocharger set to run 5-7 psi of boost and run a newer fuel management system
The sniper would probably be easier but ditching the 3Fe intake manifold would be a downgrade in performance. You would be better to go @cruisermatt 's advice and retain the stock intake as its properly tuned to the airflow needs of the engine. Plus it will look stock which has other benefits.
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