Any gains adding 1.6 rockers to stock 273?

I wish I had asked to have my 273 heads flowed. It doesn't matter to me but it would be fun and interesting to have some numbers. One was a 920 had and one a #238. (engine repairs done back in 73. There was one late 1972 rod bearing) If I ever take my heads off for any reason I should have someone flow them just for fun.

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