Any gains adding 1.6 rockers to stock 273?

Bewy said

1.6 rockers increase the effective duration about 2*. You would be lucky to feel the difference with a stock-ish engine....

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That is, IF the pushrod angle is optimal. Small block Mopar pushrod angle is anything BUT optimal. As a general rule, you lose about .020" of total lift regarding the terrible pushrod angle.