My first race car my 409 Impala started life as the 340 HP low perf 409 with cast pistons. Hammered on it hard for years 6000 rpm side steps. Ran 106-108 mph in the 1/4 in a 3860lb car. Cast pistons did not hold up to dropping an exhaust valve though! Never found the valve head. I'd bet for a mild motor you'd be fine.
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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
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