Don't believe the 72 SS was available with the 307, 350 and up were the engine options. Given that, unless your car is all original I don't think you'll hurt the resale value. Actually you'll probably improve it. If it is all original I would be hestant to change it, at least hang on to the 307 if you do go with a 350.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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